Back Matter

PRESENTS MADE TO THE ROYAL SOCIETY From November 1779 to June 1780; WITH The NAMES of the DONORS. Donors. | Presents. ---|--- Nov. 4. John Bernoulli. | A Sexcentenary Table, exhibiting at Sight the Result of any Proportion where the Terms do not exceed 600 Seconds or 10 Minutes. 4° Mr. Ramsden. | A Description of an Engine for dividing strait Lines on Mathematical Instruments. 4° Board of Longitude. | The Nautical Almanack for 1781. 8° Dr. Ingenhouz. | Experiments on Vegetables, discovering their great Power of purifying the common Air in the Sunshine. 8° Mr. W. Hey. | Observations on the Blood. 8° Mr. Nichols. | Account of the Alien Priories in England and Wales, 2 vols. 8° Professor Toaldo. | Novæ Tabulæ Barometri Æstusque Marini. 4° Marquis of Cafali. | In morte del insigne Letterato Francesco Maria Zanotti; with a Medal in Memory of the said Zanotti. fol. Mr. Charles Bonnet. | Collection complette des Œuvres de Charles Bonnet, 3 vols. 4° Francis Hoafér. | Memoria sopra il fale sedativo Naturale della Toscana. 8° Donora Donors. Nov. 25. Academy of Berlin. John Bernoulli. Dr. Ortega. Mr. Steele. Mr. De Lannay. Board of Longitude. Sir Joshua Reynolds. Mr. John Elliot. Dec. 2. Dr. Simmons. Rev. Mr. Crawford. Mr. John Obad. Justamond. Mrs. Maty. Jan. 13. Academy at Petersburg. Rev. Dr. Kippis. Feb. 3. Society at Gottingen. Mr. Hope. Board of Longitude. Arthur Young, Esq. Lord Mahon. Alexander Dalrymple, Esq. Nouveaux Membres de l'Acad. Roy. des Sciences & Bell. Lett. de Berlin, pour 1776. Nouvelles Litteraires de divers Pays, 3d and 4th Numbers. Tratado de las Aqüas Termales de Trillo. Profodia Rationalis; or an Essay towards establishing the Melody and Measure of Speech, to be expressed and perpetuated by peculiar Symbols. Mem. sur l'Origine des Fossiles accidentels des Provinces Belgiques. Lettre sur la Tourmaline. The Nautical Almanack for 1782, 1783. Seven Discourses delivered in the Royal Academy. Philosophical Observations on the Senses of Vision and Hearing. The Anatomy of the Human Body. Experiments and Observations on Animal Heat. Account of the Methods pursued in the Treatment of cancerous and schirrous Disorders. An engraved Portrait of the late Dr. Maty. Acta Academice Scientiarum Petrop. for 1777. Biographia Britannica, vol. 1st and 2d, fol. Commentationes Societatis Regiae Scientiarum Gottingensis, vol. 1. First Part of the nineteenth Volume of the Transactions of the Society at Harlem. Nautical Almanack for 1784. A Tour in Ireland, with general Observations on the present State of that Kingdom. Principles of Electricity, containing divers new Theorems and Experiments. Some Views of Tanjour and other Places in India. Donors. Donors. Feb. 24. Don Antonio da Ulloa. Mr. Portal. March 2. Mr. Dakar. April 13. Mr. Trembley. 20. Anton. Scarpa. 27. Mr. Tiberius Cavallo. May 4. Mr. Vaufenville. Mr. Jeaurat. Mr. Degaulle. Michael Girardi. Mr. Diemar. 25. Dr. Alexander Wilson. June 1. John Howard, Esq. 8. Mr. J. de Magellan. Mr. Nichols. 15. Mr. De Luc. Mr. Landen. Presents. An Account in Spanish of the Eclipse of the Sun of 24th June, 1778. 8° Observations sur la Rage. 8° A Description of the Universe. 4° Instructions d’un Pere à ses Enfans, 3 vols. 8° De Nervorum gangliis & plexibus. 4° De Structura fenestræ rotundæ auris, et de tympano secundario. 8° Essay of Medical Electricity. 8° Essai Physico-Geometrique. 8° Connoissance des temps pour l’année 1782. 8° Construction et Usage d’un nouveau Compas Azimatal à Reflexion. 8° Dominici Santorini septemdecem Tabulae, fol. The History and Amours of Rhodope. 4° Observations on the Influence of Climates on Animal and Vegetable Bodies. 8° Appendix to the State of the Prisons in England and Wales. 4° Collection de differens Traités sur des Instruments d’Astronomie Physique. 4° A Collection of Royal Wills. 4° Aristeé, ou de la Divinité. 12° Sophyle, ou de la Philosophie. 12° Lettres Physiques et Morales sur l’Histoire de la Terre et de l’Homme, 6 vols. 8° Mathematical Memoirs respecting a Variety of Subjects. 4° AN INDEX TO THE SEVENTIETH VOLUME OF THE PHILOSOPHICAL TRANSACTIONS. A. ACID. Experiments on a new animal acid, p. 189. Acids. The most powerful mineral acids do not lessen the activity of the poison of vipers, p. 181. Mineral acids lessen the activity of the poison of Ticunas, p. 182. But are no remedy against it, p. 184. Agriculture. Considerable improvements in, p. 345-352. Air. At sea examined by the nitrous test, p. 354. At Gravesend by the same, p. 356. Apparatus for examining its salubrity at sea, p. 356. Some experiments on its salubrity on land, p. 359. How to ascertain whether leaves contribute to its salubrity, p. 362. Estimate of the salubrity of that at Ostend, p. 366. And at Bruges, ibid. And at Ghent, ibid. At Brussels, p. 369. And at Antwerp, ibid. And Breda, ibid. And Rotterdam, p. 370. And of that of the Moor-dyke, ibid. And of Delft, ibid. And of the Hague, ibid. And of Amsterdam, ibid. And of Rotterdam, ibid. And of a lake near Rotterdam newly drained, p. 372. And of Hollands Dieppe, p. 373. And of various other places in France and Flanders, p. 374. Observations and experiments on the comparative temperature of hoar-frost, and the air near it, p. 451-470. Very cold, not often disposed to deposit its contents, except upon bodies as cold or colder than itself, p. 471. Algebra. Pleasure of considering how peculiar methods in, were first discovered, p. 222. Alkali. The most active, make no change in the poison of Ticunas, p. 183; A true fixed vegetable alkali discovered, p. 350. And yielded in greater quantities than that from the white Muscovy ashes, p. 350. Process for purging the newly discovered, of sulphur, ibid. Ammoniac salt. An animal Ammoniac salt described, ibid. Animals. Have dispositions to deviate from nature, p. 527. Distinguishing marks between the sexes of, p. 528. Resemblance of the sexes of, to each other in secondary properties, p. 520. Arrows. Experiments with the poison of some Indian, p. 180. Astronomical Observations on the periodical star in Collo Ceti, p. 338. Relating to the mountains of the moon, p. 507-514. Attraction. Calculation to determine at what point in the side of a hill it will be the greatest, p. 1. That point found to be generally at one-fourth of the altitude from the bottom, p. 3. B. Baker, Sir George, Shews that Dr. Mead drew a wrong conclusion from a case quoted by Mauriceau, p. 140. Cases mentioned by him of children who did not catch the small-pox from the mother in the womb, ibid. Barker, Mr. His meteorological diary for 1779, p. 474. Barnard, Mr. His method of removing ships that have been driven on shore, and damaged in their bottoms, to places (however distant) for repairing them, p. 100. Bartholinus, Thomas. His account of a case in which the foetus was supposed to have received the small-pox from the mother, p. 139. Barometer. Table of the greatest, least, and mean heights of the, at Fort St. George, from March, 1777, to May, 1778, p. 268. Register of the, at Lindon, in 1779, p. 474. See Meteorology. Birch, Mr. His way of extracting pot-ash from dung-hill water, p. 350. Bodies. Experiments to determine what parts of them are affected by the poison of Ticunas, p. 190. Boerhaave. His opinion about the possibility of the small-pox being communicated to the child in the womb, p. 106. Bouguer, Mr. His account of a mist seen on the Andes, p. 159. Blizard, Mr. His method of treating the fistula lachrymalis, p. 239. Blood. Experiments on the effect the poison of Ticunas produces on the, p. 191-203, 205. Burning bodies. The conducting power of the effluvia of burning bodies tried with an instrument contrived for that purpose, p. 217. Cardan. Cardan. Appendix to a paper concerning a method of extending his rule for resolving one case of the cubic equation $x^3 - qx = r$ to the other case of the same equation which it is not naturally fitted to solve, and which is therefore called the irreducible case, p. 85. A conjecture concerning the method by which his rules for resolving the cubic equation $x^3 + qx = r$ in all cases (or in all magnitudes of the known quantities $q$ and $r$) and the cubic equation $x^3 - qx = r$ in the first case of it (or when $r$ is greater than $\frac{2q\sqrt{q}}{3\sqrt{3}}$, or $\frac{rr}{4}$ is greater than $\frac{q^3}{27}$) were probably discovered by Scipio Ferreus, of Bononia, or whoever else was the first inventor of them, p. 221. A paradox in his theorem cleared up, p. 407. His rule useful in the solution of equations that have three real roots, p. 443. Cattle. History of the distemper among the horned, in 1769, p. 536. Carvallo, Mr. Thermometrical experiments and observations by, p. 581. New experiments in electricity by, p. 27. Cazaud, Mr. His method of constructing mills for sugar-canies, p. 318. Chemical observations on the poison of Ticunas, p. 167. Chefton, Mr. His account of an ossification of the thoracic duct, p. 323. Chicken-pox. Difference between it and the smallpox, in its appearances, p. 134. Chymists. A produce of petrefaction not noticed by them, p. 350. Chrysalis. Fragments of large regular ones picked up in an excursion to Vesuvius, p. 48. Cockin, Mr. His account of an appearance in a mist, p. 157. Cold. Account of a most extraordinary degree of, at Glasgow, in January, 1780, p. 451. Cooling process takes place in some circumstances, but depends upon principles different from evaporation or chymical solution, p. 469. Air seldom deposits its contents upon bodies not colder than itself, p. 471. Colours. Effects of the light of the sun and a lamp upon Thermometers whose balls are painted of different colours, p. 588. La Condamine, Mr. Mistaken in some assertions relating to the Indian poison, p. 167. Copper-ores. New method of assaying them, by Dr. Fordyce, p. 30. Principles on which troublesome roastings and fusions in great degrees of heat may be avoided, and the several substances contained in the metal shewn, p. 33. Cheapness and other advantages of this process, p. 36. The copper from blue vitriol may be precipitated by iron, p. 37. Which is the most proper acid menstruum for copper ores, p. 38. Processes used in the assay of, p. 39. Criterion to judge whether any of the copper be lost during the process, p. 40. Countries exposed to noxious exhalations, wholesomer in summer than winter, p. 370. Crell Professor. Some experiments on a new animal acid, p. 109. Cubic. See Equation. D. Deck. Description of two decks, lain in the hold of a ship to swim her independent of her own leaky bottom, p. 133. Deftandes, Mr. Experiments made by him with water poured upon a quantity of glass in fusion, p. 75. Diameter. The apparent diameter of the celestial bodies defined, p. 341. Disease. An epidemical, upon draining a meer in the neighbourhood of Rotterdam, p. 372. Disease. Account of those prevalent at Fort St. George, on the coast of Coromandel, in 1777 and 1778, p. 269. Some occasioned by the East wind at Senegal, p. 486. Disorder. Some account of a fatal putrid one at Senegambia, p. 478. What sort of a, is produced by the poison of Ticunas, p. 190. General reflexions on those commonly called nervous, p. 205. Dung-bill water. Pot-ash extracted from it, p. 350. Useful in agriculture, p. 352. Dying. Improvement proposed in dying wool and silk, p. 351. E. Eels. Experiments on, with the poison of Ticunas, p. 188. Effects of the water of the Lauro-cerasus on, p. 214. Electricity. An account of some new experiments in electricity, with the description and use of two new electrical instruments, p. 15. Confirmation of Mr. Ronayne's experiment of the electricity of fogs, p. 26. Electricity of sealing-wax, how affected by water, ibid. Water deprives a glass tube of it, p. 27. Its effects on a glass tube excited with the amalgamated rubber, and on a stick of sealing-wax rubbed with flannel, ibid. The conducting power of the effluvia of burning bodies tried with an instrument constructed for that purpose, ibid. Fumes, arising by the action of a lens from the amalgam of tin-foil and mercury, conduct very badly, p. 29. Experiment made with a Leyden bottle during an eruption of Vesuvius, p. 59. Its effects in shortening wires, p. 334. Iron wire resists the passage of the electric fluid much more than copper, p. 370. Electrometer. The improved atmospherical, described, p. 21. Uses of this Instrument, p. 23. Best method of Electrifying it, p. 24. How to use it in trying the electricity of fogs, air, and clouds, p. 25. Electrophorus. Explanation of an experiment of Professor Lichtenberg with the, p. 15. Ellipse. Some theorems concerning it, applied to the engine for turning ovals, p. 380. Engine. Properties of that for turning ovals in wood or metal, p. 378. Properties of one for drawing ovals upon paper, p. 378. Equation, cubic. Appendix to a paper, intitled, a method of extending Cardan's rule, for resolving one case of the cubic equation, $x^3 - qx = r$, to the other case of the same equation, which it is not directly fitted to solve, and which is therefore called the irreducible case, p. 85. See Cardan. Equations. Improvements of some known properties of, and discovery of others, p. 287. Way of assigning the roots of, by infinite series, p. 415. Evaporation. What is called the cooling process depends upon principles different from, p. 469. F. Ferreus Scipio. Conjecture of the method by which he discovered Cardan's rules. See Cardan. Fire. The culinary and electrical, have different effects on iron and copper, p. 337. Fissula Lacrymalis. New method of treating the, p. 239. Common methods of avoiding the operation for the, p. 241. Fetus. The small-pox communicated to one, by the mother, p. 128. Mr. Hunter's reflections on this case, p. 131. Fogs. Confirmation of Mr. Ronayne's experiment of their electricity, p. 26. Fordyce, Dr. His new method of assaying copper ores, p. 31. Fractions. Theorems useful in deriving the logarithms of great fractions from those of small ones, p. 308, 312. Frogs. Experiments on, with the poison of Ticunas, p. 188, 203. Frost. How it contributes to purify the atmosphere, p. 362, 376. Observations and experiments on the comparative temperature of hoar-frost, and the air near it, p. 451. See Cold. G. Gibraltar. Its healthiness, p. 377. Giants Causeways. Supposed to be the nuclei of volcanic mountains, whose lighter and less solid parts may have been worn away by the hand of time, p. 48. Glasgow. Extraordinary cold at, in January 1780, p. 451. Gold leaves dissolved by an animal acid, p. 127. Grant, Mr. Account of Mrs. Ford's case, p. 131. Guinea-pigs. Experiments on, with the poison of Ticunas, p. 170, 174, 179, 187. See Ticunas. Harmattans, H. Harmattans, on the coast of Guinea, agree with the East-wind of Senegal, p. 489. Heat. Thermometrical experiments on, p. 582. Its intensity does not decrease in the duplicate proportion of the distance, p. 587. Hellinga, Mr. Theorems for computing logarithms, p. 307. Hens. Experiments on, with the American poison, p. 175. Experiments on them with the poison of Indian arrows, p. 180. Hermaprodites. Some account of, p. 529. Herchell, Mr. His observations on the periodical star in Collo Ceti, p. 338. Astronomical observations relating to the mountains of the moon, p. 507. His method of finding the height of a lunar mountain, from observations made when she is not in her quadrature, p. 512. Manner in which he made his observations on the mountains in the moon, p. 522. Hevelius. Method used by him to find the height of a mountain in the moon, p. 508. His observations on the mountains in the moon to be preferred to Galileo's, p. 517. Hill. Calculations to determine at what point in the side of one, its attraction will be the greatest, p. 1. That point found to be generally at about only one-fourth of the altitude from the bottom, p. 3. Homberg's pyrophorus not affected by light, p. 592. Hunter, John. His reflections on the case of Mrs. Ford, supposed to have communicated the small-pox to her fetus, p. 131. His account of an extraordinary phænomenon, p. 527. Hutton, Dr. His calculations to determine at what point in the side of a hill its attraction will be the greatest, p. 1. New and important properties of cubic equations discovered by, p. 387. J. Jones, James. His case, p. 323. Continuation of the case of, p. 578. Japan. Journal kept by Dr. Thunberg during his residence there, p. 163. I. Ingen-Housz, Dr. His examination of sea air by the nitrous test, p. 354. Indian poison. Experiments on different animals with arrows impregnated with the, p. 180. Experiments with poisoned arrows from the East-Indies, p. 207. Instrument. One for trying the conducting power of the effluvia of burning bodies, p. 27. And an experiment made with it, p. 28. One to introduce quicksilver into the nasal duct, for the cure of the fistula lachrymalis, p. 242. The properties of one for drawing ovals upon paper demonstrated, p. 378. Jugular vein. Effects of the American poison when introduced through the, p. 195. Water of the Lauro-cerasus introduced into the, p. 247. L. La-Lande, Mr. de. His opinion of Hevelius's observations on the mountains in the moon, p. 511. Lamp. Effects of the light of a, on thermometers, p. 586. Lava. More subject to crystalline within the bowels of a volcano than after its emission, p. 48. Supposed to have mounted ten thousand feet in an eruption of Vesuvius, p. 57. Uncommon size of the fragments of, thrown out of Vesuvius, p. 77. Particularities in that of the eruption of 1779, p. 81. Lauro-Cerasus. Experiments on animals with the water of the, p. 210. Means of increasing the activity of the poison of the water of the, p. 212. Effects of the water of the, on the nerves, p. 216. And on the blood, p. 217. Layard, Dr. His letter relative to the distemper among the horned cattle, p. 536. Light. Thermometers, with the balls painted black, shew a stronger degree of heat when exposed to a strong day-light, p. 584. Every day's degree of, attended with a degree of heat, p. 585. Does not decrease in the inverse proportion of the square of the distance, p. 587. Homberg's pyrophorus not affected by it, p. 592. Logarithms. Theorems for computing them, p. 307. Logarithm of two how computed, p. 310. The construction of them may be improved, p. 316. Ludlam, Mr. His demonstration of the properties of the engine for turning ovals in wood or metal, and of the instrument for drawing them upon paper, p. 378. Lungi. The, materially affected by the poison of Ticunas, p. 194. M. Maftait, Dr. His account of a mist seen in Scotland, p. 160. Manfredonia. Fall of minute ashes there in an eruption of Vesuvius, p. 68. Mauriceau brought five or six pustules of the small-pox into the world, p. 137. Mr. Hunter's opinion of his case, ibid. Maferes. See Cardan. Maupertuis, Mr. His account of the causes of the periodical appearances of changeable stars not contradicted by Mr. Herschel's observations, p. 338. Mead, Dr. His opinion of the small-pox being communicable to the foetus by the mother, p. 139. History told by him to confirm this opinion, p. 132. Medical Transactions. A paper in them, mentioned, p. 140. Vol. LXX. Metals. Attracted more strongly by acids than by sulphurs, p. 33. When combined with sulphur may be separated by applying an acid, which will unite with the metal, and separate the sulphur, ibid. Separated from the acid in its metallic form by means of another metal which attracts the acid more strongly, ibid. How to treat metal which is in the ore in the form of a calx, p. 34. How to proceed with the greater spars and other earthy matters mixed with metals, ibid. How to act when the earthy matter dissolves in the acid, p. 35. Examination of a principle which is of great use in investigating the elements of mixed metals, ibid. Metals in mineral waters combined with no other substance but the vitriolic acid, p. 37. Peculiar property of metallic salts, how tried, p. 38. The oil of metals defined, ibid. Meteor. An unusual, described, p. 157. Two instances of the like kind, p. 159. Meteors. The air very full of them during an eruption of Vesuvius, p. 63. Meteorological register kept at Manchester in 1774 and 1775, p. 348. Meteorology. A diary kept at Fort St. George, on the coast of Coromandel, p. 246. Journal of the weather at Montreal in 1778 and 1779, p. 272. Journal kept at the house of the Royal Society in 1779, p. 280. Mills. Mode of estimating the advantages of any particular kind of mills for pressing sugar-canies, p. 318. Mist. Mr. Cockin's account of an appearance in a, p. 157. Two mentioned by Dr. Priestley, p. 159. And one mentioned by Don Ulloa, p. 160. Explanation of that observed by Mr. Cockin, ibid. Monsters. Great variety of, p. 527. Moon. Astronomical observations relating to the mountains of the, p. 507. Difference betwixt Galileo and Hevelius about the height of the lunar mountains, p. 509. Method of finding the height of a lunar mountain from observations made when she is not in her quadrature, p. 512. Height of the lunar mountains generally much over-rated, p. 517. Thermometrical experiment to render the heat of the light of the, visible, p. 585. Motion. The principles of progressive and rotatory, investigated, p. 548. N. Nairne, Mr. His account of the effects of electricity in shortening wires, p. 334. Needle. Variation of the, observed at the Royal Society's house in July 1779, p. 305. Dip of the, observed at the Society's house in 1779, p. 306. Nerves. Supposed to be affected by the poison of Ticunas, p. 190. Experiments to determine whether it be so, p. 191. 198. 201, 202. General reflections on disorders commonly called nervous, p. 205. Not affected by the water of the Lauro-Ceraus, p. 217. Nitre. The nitrous test applied to the examination of sea air, p. 354. And of air at land, p. 359. O. **Ossification.** An ossification of the Thoracic duct, p. 323. 578. **Ostend.** Salubrity of the air of, estimated, p. 374. A remarkable healthy place, p. 376. **Oval.** Properties of the engine for turning them in wood or metal, p. 378. And of that for drawing them on paper, ibid. **Ottaiano.** Account of it during an eruption of Vesuvius, p. 68. **Ox's fat.** Experiments on an acid made of it, p. 111. Easier method of obtaining the acid made of, p. 127. P. **Pambamaroa.** Singular mist observed there, p. 160. **Percival, Dr.** Account of a new and cheap method of preparing pot-ash, p. 345. **Pea-hen.** One with the feathers of the cock, p. 534. **Pheasant.** Account of an extraordinary, p. 527. Examination of a hen pheasant with the feathers of the cock, p. 532. **Philosophical Transactions.** Cases adduced from, in support of the small-pox being communicable to the foetus by infection, p. 138. **Pigeons.** Experiments on, with the poison of Ticunas, p. 160. 175. 177. 185. 191. and with the oil of Tobacco, p. 209. **Poison.** Remarks on that of Ticunas, p. 165. And comparison of it with that of vipers, p. 168. See Ticunas. **Pot-ash.** Account of a new and cheap method of preparing it, p. 345. Profits of this method, 345. Chemical analysis of a particular kind of, p. 349. **Priestley, Dr.** Two instances of extraordinary meteors mentioned in his history of light and colours, p. 159. **Prussian-blue.** Proposal for improving the manufacture of, p. 351. **Putrefaction.** A product of, not noticed by chymists, p. 350. **Putrid.** Account of a fatal putrid disorder at Senegambia, p. 480. **Pumice-stone.** Pieces of a substance very much like it, sticking to fragments of lava, p. 81. **Pyrophorus.** Experiment to shew whether Homberg's is impaired by light, p. 592. Q. **Quicksilver.** Used for the cure of the fistula lachrymalis, p. 241. R. **Rabbits.** Experiments made on, with the poison of Ticunas, p. 170, 173, 175, 187, 195. Experiments on the sciatic nerves of, p. 198. Experiments with the water of Lauro-Cerasus on, p. 213. **Rain.** Mean quantity of what falls annually at Manchester, p. 348. Register of the, at Lyndon, in 1779, p. 474. **Refractors.** Caution to those who use Mr. Dollond's, of three feet and a half, in measuring the mountains in the moon, p. 519. **Rum.** Its effects when mixed with the American poison, p. 182. S. **Salts.** Peculiar property of metallic, how tried, p. 38. **Sea-air.** An apparatus for examining it, p. 358. Examined by the nitrous test, and found to be more wholesome than the air at land, p. 357, 363. Proved by experiment to be better than that of land, p. 375. **Segner, J. A.** His experiments on a new animal acid from the fat of oxen, p. 109. **Senegal.** Account of, p. 478. **Sinagambia.** Account of the weather there during the prevalence of a fatal putrid disorder, p. 478. Putrid disorder there described, p. 488. **Series.** Way of assigning the roots of cubic equations by infinite, p. 415. **Serpents.** Experiments on them with the poison of Ticunas, p. 188. **Stars.** Remarks on the resemblance of the, in secondary properties, p. 529. **Ships.** Method of removing those driven on shore, or damaged in their bottoms, to distant places, for the purpose of repairing them, p. 100. **Silk.** Improvement proposed in dying it, p. 351. **Skin.** The principal part susceptible of the variolous stimulus, p. 135. **Small-pox.** A woman who had it during pregnancy, and communicated the same disorder to the fetus. Quere, whether adults, who are said to escape it, may not have had it in the womb, p. 130. Its true characteristic, p. 133. Difference between it and the chicken-pox in its appearances, p. 134. Whether the skin is the only part of the body exposed to this stimulus, p. 135. How it may be communicated to the child in the womb, p. 136. Causes adduced in support of its being communicable in this manner, ibid. Why this does not happen oftener, p. 141. **Smith, Dr.** Correspondence of a mist observed by Mr. Cockin, with some appearances observed by him, p. 160. **Snow.** Experiments made with thermometers in, p. 455, 457, 463. Star. Astronomical observations on the periodical star in Collo Ceti, p. 338. Proof of the change in the magnitude of the fixed, from β ceti being much larger than α, p. 339. Definition of the apparent diameter of α, 340. Sugar-mills. The first, made without any fixed principles, p. 318. See Cassaud. T. Theories. Doubts conceived with regard to some medical, p. 163. Theorems. Useful ones in Logarithms, p. 308. Theorems for deriving the logarithms of great fractions from those of small ones, p. 312. Thermometer. A table of the greatest, least, and mean heights of, at Fort St. George, from March, 1777, to May, 1778, p. 268. Register of, at Lyndon, in 1779, p. 474. Thermometrical observations made at Senegambia in 1778, 1779, p. 492. Experiments on the greater degree of heat shewn by one with a blackened bulb, p. 582. 584. Way of graduating some, ibid. Painted black, shew a greater degree of heat when exposed to the strong day-light, p. 584. Experiments on some painted of different colours, p. 588. How to construct the scales of some, p. 590. Thermometrical experiments made at Glasgow, p. 451. See Meteorology. Thoracic duct. Account of an ossification of the, p. 323. Thumberg, Dr. Journal kept by him during his residence at Japan, p. 143. Picunas (the poison of). Experiments made with it, p. 163. Its vapours not noxious, p. 167. Its chemical analysis, ibid. Not hurtful when applied to the eyes, p. 169. Experiments on rabbits with it, p. 170. Is a poison when swallowed in large quantities, p. 171. Farther experiments on its activity, p. 172. Experiments on it applied to the skin slightly wounded with a lancet, p. 173. Experiments with it on Guinea-pigs and pigeons, p. 170. 174. Sometimes proves fatal when the skin is slightly wounded, p. 176. Experiment on the quantity necessary to kill an animal, p. 176. 178. Experiments on it infused into the crests or ears of animals, p. 178. Is fatal when applied to the muscles, p. 179. Its action when mixed with mineral acids, p. 181. And with vinegar and rum, p. 182. Supposed to be rendered innoxious by mineral acids, p. 183. But not by alkalis, ibid. Acids no remedy against it, p. 184. Experiments on the time it takes to diffuse itself through the body, p. 185. Its effects on cold-blooded animals, p. 188. Experiments to determine what parts of bodies are affected by it, p. 190. Its effects on the blood, p. 191. 195. Produces a material alteration in the lungs, p. 194. Tobacco. Experiments made on animals with the oil of, p. 209. Tornadoes. Supposed to bring some pestiferous qualities with them, p. 481. Trees. Efficacy of the leaves of, in improving the air, conjectured, p. 361. And mode of ascertaining it proposed, p. 361. Tropea. One at Naples during an eruption of Mount Vesuvius, p. 53. V. Van Swieten. His ideas about the small-pox being communicable to the foetus in the womb, p. 136. Vegetable. Remarks on vegetable poisons, p. 164. Vegetables. An alkali from the ashes of, after their acid has been altered by a complete putrefaction, p. 350. Ventaroli, under the palace of Ottaiano, described, p. 72. Vesuvius. Account of an eruption of, in August, 1779, p. 49. Sketch of its history since 1767, p. 43. Account of an eruption of, in May, 1779, p. 45. Remarkable circumstance of Sir William Hamilton's walking across a stream of lava without being hurt, p. 46. Stones, scoriae, and ashes shot up 2000 feet, p. 50. Account of some uncommon filaments of vitrified matter shot up with these ashes, p. 51. So. Melancholy condition of the inhabitants of Ottaiano and Caccia Bella after an eruption of, p. 66. Fall of ashes at 150 miles distance, p. 68. Changes in the face of, by the last eruption, p. 77. Vince, Mr. Investigation of the principles of progressive and rotatory motion, p. 546. Viper. The poison of, supposed to be fatal when swallowed in large quantities, p. 171. Essential difference between it and the American, p. 174. Analogy between them in a particular instance, p. 179. Activity of the poison of vipers not lessened by mineral acids or alkalies, p. 181. Its poison acts quicker than the poison of Ticunas, p. 187. Farther comparison between these two poisons, p. 188. Experiments on animals with the poison of the, p. 189. Farther analogy of its poison with American poison, p. 190. 192. Vitrifications. Some very curious, in the eruption of Vesuvius in 1779, p. 83. W. Wastall, Mr. His account of Mrs. Ford's case, p. 129. Water. Experiments to deprive sealing-wax of its electricity by, p. 27. A glass tube deprived of its electricity by it, ibid. How cooled by the blacks at Senegal, p. 484. Wax, Sealing. Experiment to deprive it of its electricity by water, p. 26. Weather. See Meteorology. Account of it in 1779, p. 475. At Senegambia, during the prevalence of a fatal putrid disorder there, p. 478. Great change of, had no effect on the barometer at Fort James, Gambia, p. 490. Journal of it at Senegambia, in 1778, 1779, p. 492. Wilson, Mr. His account of an extraordinary degree of cold at Glasgow in January, 1780. Some experiments and observations on the comparative temperature of hoar-frost, and the air near to it, p. 451. Wind. Effects of the East-wind at Senegal, p. 484. Wire. Effects of electricity in shortening them, p. 334. Iron wire resists the passage of the electric fluid more than copper, p. 337. Wool. Improvement proposed in dying it, p. 350. FROM THE PRESS OF J. NICHOLS. MDCCLXXX.