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PRESENTS MADE TO THE ROYAL SOCIETY From November 1786 to July 1787; WITH The NAMES of the DONORS. Presents. Donors. 1786. Nov. 9. Mémoires de l'Académie Royale des Sciences, Année 1783. Paris, 1786. 4° Table générale des Matières contenues dans les Mémoires de l'Académie des Sciences, 1771—1780. Tome IX. Paris, 1786. 4° Acta Academiae Scientiarum Imperialis Petropolitanae, pro anno 1780, Pars prior et posterior; 1781, Pars prior et posterior; 1782, Pars prior. Petropoli, 1783—1786 4° Eloge de M. Leonard Euler, par Nic. Fuks. St. Peterbourg, 1783. 4° Kongl. Vetenskaps Academiens Nya Handlingar. Tom. VI. for 1785, 3d and 4th Quarter; and 1st Quarter of Tom. VII. for 1786. Stockholm. 8° Commentationes Societatis Regiae Scientiarum Gottingensis ad A. 1784 et 1785. Vol. VII. Gottingæ, 1786, 4° The Royal Academy of Sciences at Paris. The Imperial Academy of Sciences at Petersburg. The Royal Academy of Sciences at Stockholm. The Royal Society of Sciences at Gottingen. Nov. 1786. Nov. 9. Transactions of the Society for Encouragement of Arts, Manufactures, and Commerce. Vol. IV. London, 1786. Transactions of the American Philosophical Society held at Philadelphia. Vol. II. Philadelphia, 1786. Atti della Società Patriottica di Milano. Vol. I. Parte I. Milano, 1783. Flora Rossica, edidit P. S. Pallas. Tom. I. Pars I. Petropoli, 1784. Rogerii Josephi Boscovich Opera pertinentia ad Opticam et Astronomiam. Tomi V. Bassani, 1785. Traité Analytique des Mouvemens apparens des Corps Célestes, par M. Dionis du Séjour. Tome I. Paris, 1786. Extrait des Mémoires de l'Académie Royale des Sciences, pour l'année 1783, sur l'Usage des Horloges Marines, relativement à la Navigation, par M. le Marquis de Chabert. Paris, 1785. Extrait des Observations Astronomiques et Phyiques, faites à l'Observatoire Royal, en l'année 1785, par M. le Comte de Cassini, Directeur. Paris, 1786. Description des gîtes de Mineraï, des Forges et des Salines des Pyrénées, par M. Le Baron de Dietrich. 2 Vol. Paris, 1786. Teoria e Pratica delle Resistenze de Solidi ne' loro attriti, Parte 2, dall' Abate Leon. Ximenès. Firenze, 1782. An Introduction and Notes on Mr. Bird's Method of dividing Astronomical Instruments, by W. Ludlam. London, 1786. Commentarii de Rebus in Scientia Naturali et Medicina gestis. Volumen XXVII. Lipsiae, 1785—6. Clinical Observations on the Use of Opium in low Fevers, and in the Sy- Donors. The Society for Encouragement of Arts, Manufactures, and Commerce. The American Philosophical Society. The Patriotic Society of Milan. The Empress of Russia. Abbé Boscovich, F.R.S. M. Dionis du Séjour, F.R.S. Marquis de Chabert, F.R.S. Comte de Cassini. Baron de Dietrich. Abbé Ximenès. Alexander Aubert, Esq. F.R.S. Mr. Philip Hurlock, F.R.S. Martin Wall, M.D. 1786. nochus, by M. Wall. Oxford, 1786. 8° Nov. 9. Airopaidia, by Th. Baldwin. Chester, 1786. 8° An entire new Work and Method of proceeding to discover the Variation of the Earth's Diameters. London, 1786. 4° La Filosofia dell' Eloquenza. 2 Vol. Napoli, 1783. 8° Pro Stabiarum Dynastarum Majestati- bus Elogia. 8° A sa Majesté Imperiale Catherine II. offrande de Fr. Astore. 8° In Imperatoris Josephi II. effigiem Eπιγεγμονα, adscribebat Fr. Ant. Astore. Neapoli, fol. Parnasso Italiano dell' anno 1784. Bo- logna. 8° Giornale Enciclopedico del Regno di Napoli, Ottobre 1785. 8° Saggi Politici di Fr. M. Pagani. 2 Vol. Napoli, 1785. 8° Lettera di D. Serafino Serrati ad un suo Amico. Firenze, 1786. 16° 16. Dissertations de uniformitate motus diurni Terræ, Auctoris Joh. Fred. Hennert et Paulo Friso. Petropolis. 4° Observations on certain Parts of the Animal Oeconomy, by J. Hunter. London, 1786. 4° Essai sur l'Histoire Naturelle des Roches, par M. de Launay. Bruxelles, 1786. 12° Aufmunterung zu sorgfältiger Mitte- forschung der Verhältnisse, welche die Gewächsarten bey ihrer Vegeta- tion gegen einander beobachten, von F. A. L. von Burgsdorf. 1785. 4° Die Tegelsche Baumzucht in einem Grundverzeichnisse, durch den Forst- rath von Burgsdorf. Fol. pat. Dec. 7. Idées sur la Météorologie, par J. A. De Luc. Tome I. 2 Vol. Londres. 1786. 8° Tracts Mathematical and Philosophical. Vol. I. London, 1786. 4° Donors. Thomas Baldwin, Esq. Thomas Williams. Signor Francesco Antonio Astore. Sign. Francesco Mario Pagano. D. Serafino Serrati, The Imperial Academy of Sciences at Petersburg. John Hunter, Esq. F.R.S. M. de Launay. M. von Burgsdorf. M. De Luc, F.R.S. Charles Hutton, LL.D. F.R.S. Dec. Presents. 1786. Dec. 7. Memoirs of John Fothergill, by J. C. Lettsom, 4th edition. London, 1786. 8° The Works of John Fothergill, with some Account of his Life, by J. C. Lettsom. London, 1784. 4° A Journal of a Voyage to the South Seas, in his Majesty's Ship the Endeavour, from the Papers of Sydney Parkinson; to which are added, Remarks on the Preface by J. Fothergill, M.D. and an Appendix. London, 1784. 4° 14. Latitudes and Longitudes of several Places, ascertained by Count de Bruhl. London, 1786. 4° Cométographie, par M. Pingré. Tome I. Paris, 1783.; Tome II. 1784. 4° M. Manilius Astronomicon Libri V. et M. T. Ciceronis Aratea cum Interpretatione Gallica, edente Al. G. Pingré. Tomi II. Parisii, 1786. 8° Essai sur le Lait, considéré médicinalement, par M. Petit-Radel. Paris, 1786. 8° 21. A Treatise on Elementary Air, by H. Kelso. Strabane, 1786. 8° 1787. Jan. 11. The Marine Atlas, a new Invention for the Preservation of Ships, and Security of Mariners, by T. South, MS. fol. The London Medical Journal. Vol. VII. London, 1786. 8° Practical Observations on the puerperal Fever, by P. P. Walsh. London, 1787. 8° Samuel Foart Simmons Observationes de Phthisi Pulmonali, ex Anglico vertit F. A. Van Zandycke. Brugis, 1786. 8° A Meteorological Journal of the Year 1786, kept in Pater-Noster-Row, London, by W. Bent. 4° Feb. 1. Original Letters, written during the Reigns of Henry VI. Edward IV. John Fenn, Esq. Donors. John Coakley Lettsom, M.D. F.R.S. Count de Bruhl. F.R.S. M. Pingré. Dr. Petit-Radel. Hamilton Kelso, M.D. Thomas South, Esq. Samuel Foart Simmons, M.D. F.R.S. Philip Pitt Walsh, M.D. Dr. F. A. Van Zandycke. Mr. William Bent. and Prefects. 1787. and Richard III. published by J. Fenn. London, 1787. 2 Vol. 4° Feb. 1. Aristotelis Liber de mirabilibus Auscultationibus, explicatus a Jo. Beckman. Gottingae, 1786. 4° Florulae Insularum Australium prodromus, Auctore G. Forster. Gottingae, 1786. 8° Poems and Essays, by a Lady lately deceased. The second Edition. Bath, 1786. 2 Vol. 12° 8. Ephemerides Societatis Meteorologicae Palatinæ annorum 1781, 1782, et 1783. Manheim, 1783—1785. 3 Vol. 4° An Account of the Effects of Swinging, employed as a Remedy in the pulmonary Consumption. London, 1787. 8° 22. J. G. F. Franzii Prolusio de Medicorum Legibus Metricis. Lipf. 1782. 4° Ejusdem Lipsia parturientibus ac puerperis nostris temporibus minus lethifera. Lipf. 1785. 4° A Defence of the Constitution of Government of the United States of America, by J. Adams. Lond. 1787. 8° Mar. 8. The Nautical Almanac for the Years 1791 and 1792. 2 Vols. London, 1786. 8° General Tables of the Moon’s Distances from the Sun and ten principal fixed Stars. London, 1787. fol. Mayer’s Lunar Tables, improved by Mr. Ch. Mason. London, 1787. 4° 22. Lucrece Newtonien, par G. L. Le Sage, détaché des Mémoires de l’Académie de Berlin pour 1782. 4° Friedrichs Sternendenkmal, vom Herrn Bode. Berlin, 1787. 4° A. J. Testa de Vitalibus Periodis Ægotantium et Sanorum. 2 Vol. Londini, 1787. 8° 29. Meteorological Journal kept at Nain, on the Coast of Labrador, from Aug. 1, 1784, to July 27, 1786, MS. 4° Donors. Professor Beckman of Gottingen. George Forster, M.D. F.R.S. Thomas Bowdler, Esq. F.R.S. The Meteorological Society of Manheim. James Carmichael Smyth, M.D. F.R.S. Professor Franz of Leipzig. John Adams, LL.D. The Commissioners of Longitude. M. Le Sage, F. R. S. Mr. J. E. Bode, Astron. to the Academy at Berlin. Professor Testa of Ferrara. Mr. Philip Hurlock, F.R.S. 1787. Mar. 29. Meteorological Journal kept at Hoffenthal, on the Coast of Labrador, from Sept. 1, 1785, to Aug. 16, 1786, MS. 8° La Meteorologia applicata all' Agricultura, di Gius. Toaldo. Venezia, 1786. 8° Nuove Esperienze intorno alla dolcificazione dell' acqua del Mare, del Sig. Cav. Lorgna. 4° Tertia Dissertatio Botanica; Auctore A. J. Cavanilles. Parisii, 1787. 4° De Maximis et Minimis, Pars prior, Auctore Sim. Lhuilier. Varsoviae, 1782. 4° April 19. Expériences sur les Végétaux, par J. Ingenhouz. Paris, 1787. 8° A Treatise on Magnetism, by T. Cavallo. London, 1787. 8° An Attempt towards obtaining invariable Measures of Length, Capacity, and Weight, by J. Whitehurst. London, 1787. 4° Mémoire sur la Culture, l'Usage, et les Avantages de la Racine d'Abondance ou de Difette, par l'Abbé de Commerell. Lausanne, 1786. 8° Della Morte apparente degli Annegati. Firenze, 1780. 8° A. J. Tetra de re Medica et Chirurgica, Epitome VII. Ferrariae, 1781. 8° 26. Kongl. Vetenskaps Academiens nya Handlingar. 2d Quarter of Tom. VII. for 1786. 8° Première Continuation des Expériences faites par le moyen de la Machine Electrique Teylerienne, par M. van Marum. Harlem, 1787. 4° May 10. Memoirs of the Medical Society of London, instituted in the Year 1773. Vol. I. London, 1787. 8° Pefanteur spécifique des Corps, par M. Briffon. Paris, 1787. 4° Connoissance des Temps, pour l'année 1789. Paris, 1786. 8° Mémoire sur la Culture de certaines Malvacées, par A. J. Cavanilles. 4° Mr. Philip Hurlock, F.R.S. Professor Toaldo of Padua. Cavaliere Lorgna. Abbé Cavanilles. M. Lhuillier. John Ingenhouz, M.D. F.R.S. Mr. Cavallo, F.R.S. Mr. Whitehurst, F.R.S. Jonathan Watson, Esq. F.R.S. Professor Testa of Ferrara. The Royal Academy of Sciences of Stockholm. Martin van Marum, M.D. The Medical Society of London. M. Briffon. M. Mechain. Abbé Cavanilles. May 10. Extrait des Ouvrages de M. l'Abbé Cavanilles. 4° 17. A general Synopsis of Birds, with a Supplement. 7 Vol. London, 1781—1787. Introduction à l'Etude de l'Astronomie Physique, par M. Cousin. Paris, 1787. 24. The Works of John Jebb, M.D.F.R.S. 3 Vol. London, 1787. 8° The one great Argument for the Truth of Christianity from a single Prophecy, evinced in a new Explanation of the Seventh Chapter of Isaiah. Yarmouth, 1787. June 7. Mémoires de l'Académie Royale des Sciences, Année 1784. Paris, 1787. 4° Rapport des Commissaires chargés par l'Académie de l'Examen du Projet d'un nouvel Hotel-Dieu. Paris, 1786. Observations sur les Obstacles qui s'opposent aux Progrès de l'Anatomie, par M. Tenon. Paris, 1785. Idées sur la Météorologie, par J. A. De Luc, Tome II. Londres, 1787. 8° The Elevation, Section, Plan, and Views of a Triple Vessel and of Wheels, by P. Miller. Edinburgh, 1787. fol. 14. Medical Remarks on natural, spontaneous, and artificial Evacuation, by J. Anderson. London, 1787. 8° 21. Tableau des Variétés de la Vie Humaine, par M. G. Daiguan. Paris, 1786. 2 Vol. 8° 28. Meteorological Journal kept at Odiham, in Hampshire, from April 1, 1786, to April 1, 1787, by A. Baxter, MS. fol. Meteorological Journal kept at Bencoolen, from Sept. 1. to Nov. 30, 1784, by John Macdonald, MS. 4° Donors. Abbé Cavanilles. Mr. Latham, F.R.S. M. Cousin. Thomas Brand Hollis, Esq. F.R.S. The Rev. Samuel Cooper, D.D. The Royal Academy of Sciences of Paris. M. Tenon. M. De Luc, F.R.S. Patrick Miller, Esq. John Anderson, M.D. M. Daignan. Alexander Baxter, Esq. Capt. Macdonald, AN INDEX TO THE SEVENTY-SEVENTH VOLUME OF THE PHILOSOPHICAL TRANSACTIONS. A: Acid, vitriolic, experiments of the action of, on steel and iron, p. 17. Experiments on the congelation of, p. 267. Air, deplogisticated, experiments on the production of, from water with various substances, p. 84. Effect of light on the production of, p. 91. Air hepatic, sur les gas hépatiques, p. 305. Algebra, on finding the values of algebraical quantities by converging serieses and demonstrating extending propositions, p. 71. Demonstration of some propositions of Pappus, p. 75. Some improvements in, by Descartes, Harriot, Schoolen, Newton, Campbell, and Maclaurin, p. 81. Anatomy, difficulties of obtaining knowledge of the larger marine animals, p. 371. Animal bodies, their power of resisting heat and cold, p. 311. Arteries of Whales, p. 415. Aurora borealis, effect of, on the magnetic needle, p. 24. B. Baker, Henry, lecture founded by him for magnetical experiments and observations, p. 6. Barker, Thomas, Abstract of a Register of the Barometer, Thermometer, and Rain, at Lyndon, in Rutland, in 1786, p. 368. Baxter, Alexander, Description of a Set of Halo's and Parhelia seen in 1771, in North America, p. 44. Beddoes, Thomas, Experiments on the Production of artificial Cold, p. 282. Benjamin Tree of Sumatra, botanical description of, p. 307. Bennet, Abraham, Description of a new Electrometer, p. 26. Appendix to the description, p. 32. Account of a Doubler of Electricity, p. 288. Bladder of Whales, p. 413. Blagden, Charles, Observations on ancient Inks, with the Proposal of a new Method of recovering the Legibility of decayed Writings, p. 451. Blane, William, some Particulars relative to the Production of Borax, p. 297. —— Dr. Gilbert, Account of five children born at a birth, p. 345. Blood, on the circulation of, in Whales, p. 413. 415. Blow-hole in Whales, p. 420. Bones of Whales and Porpoises, observations on, p. 384. Borax, on the production of, p. 297. Account of the places where, and manner in which it is produced, Italian, p. 301. English, p. 471. Bouguer, M. excellency of his hypothesis, p. 211. Table of the degrees of the earth constructed on his hypothesis, p. 220. Observations on his method for obtaining the lengths of degrees of great circles to the meridian, p. 465. Bradley, Dr. proceedings for ascertaining the latitude of the Royal Observatory at Greenwich, p. 153. Brain of Whales, p. 423. Brafs, on the magnetism of, p. 6. Acquires magnetism by being hammered, p. 7. Britain Great, from Eastnesh, in Suffolk, to the western parts of Kent, contains near 12 degrees of longitude, and from the Channel to the Orkney Islands about 9 degrees of latitude, p. 223. Brydone, Patrick, Account of a Thunder-storm in Scotland, with some meteorological Observations, p. 61. Remarks on the account, by Charles Earl Stanhope, p. 130. Bugge, Thomas, Determination of the Heliocentric Longitude of the descending Node of Saturn, p. 37. C. Campbell, on some improvements in algebra, p. 81. Cayluse renales of Whales, p. 413. Cartesius, improvements in algebra by him, p. 81. Cassini, de Thury, Memoire sur la jonction de Douvres à Londres, p. 151. Remarks on the memorial, p. 151. Cavallo, Tiberius, Magnetical Experiments and Observations, p. 6. Chloranthus, a new genus of plants, described, p. 359. Circles, Observations on M. Bouguer's method for obtaining the length of great circles perpendicular to the meridian, p. 465. Cold, artificial, experiments on the production of, p. 282. Comet, account of a new one, p. 1. Remarks on the new, p. 4. Observations on Miss Herschel's comet, p. 55. Conferva rivularis, power of extracting air from water, p. 109. Cotton, power of extracting air from water, p. 97. D. Dephlogistated air, on the production of, from water with various substances, p. 84. Effect of light on the production of, p. 91. Dog, Jackal, and Wolf, observations tending to shew them to be of the same species, p. 253. A litter of puppies from a Pomeranian bitch by a Wolf, p. 255. Method of expressing the passions in, p. 259. On the barking of, p. 265. Experiment of their resisting heat, p. 311. Dresden, longitude of, from observation of the transit of Mercury, May 4, 1786, p. 47. Dryander, Jonas, Botanical Description of the Benjamin Tree of Sumatra, p. 307. E. Earth, strata in sinking a well at Boston, Lincolnshire, p. 50. Difference of opinions on the figure of, p. 201. Attempts to discover the figure, by the use of pendulums, p. 203. Earthquake, account of one, felt in the northern parts of England, p. 35. in Scotland, July 19, 1785, p. 69. East-India Company, called upon to measure two degrees of longitude on the Coasts of Coromandel, p. 224. Eider Down, power of drawing air from water, p. 96. Electricity, the death of James Lauder by an explosion of thunder attempted to be accounted for by the laws of electricity, p. 139. Account of a doubler of, p. 288. Electrometer, a new one described, p. 26. Experiments with it, p. 27. Appendix to the description, p. 32. Equatorial micrometer, improvements in, p. 318. Equinoxes, Equinoxes, on the Precession of the, p. 363. Eye of Whales, p. 437. F. Fat of animals, observations on the different situation and substance of, p. 387. Feeling, sense of, in Whales, p. 426. Flannel, advantages of wearing shirts of, p. 243. Fordyce, George, Account of an experiment on heat, p. 310. Fur of Hares, power of extracting air from Water, p. 97. G. Garthshore, Maxwell, a remarkable Case of numerous Births, with Observations, p. 344. Generation, effect on the extirpation of one of the ovaria, p. 233. Parts of, in Whales, p. 441. Georgian planet, account of the discovery of two satellites revolving round it, p. 125. Glass spun, power of extracting air from water, p. 113. Greenwich, on the latitude and longitude of the Royal Observatory at Greenwich, p. 151. At Paris, p. 168. The mode proposed for determining the relative situation of the Observatories of Greenwich and Paris, p. 188. Supplement, p. 465. H. Hair, human, power of extracting air from water, p. 99. Halley, Dr. errors in his tables, p. 38. Halos, seen in North America, 1771, p. 44. Harriot, improvements in algebra by him, p. 87. Hassenfratz, M. sur les Gas Hepatiques, p. 305. Hearing, sense of, in Whales, p. 430. Heart of Whales, p. 414. Heat, an experiment on, p. 310. Hepatic air, sur les gas hepatisques, p. 305. Herschel, Caroline, Account of a new Comet, p. 1. Observations on Miss Herschel's comet, p. 55. Herschel, William,, Remarks on the new Comet, p. 4. Account of the Discovery of Two Satellites revolving round the Georgian planet, p. 125. Account of Three Volcanos in the Moon, p. 229. Horjes, two killed by thunder, p. 62. Hull, Mr. account of five children at a birth, p. 346. Hunter, John, an Experiment to determine the Effect of extirpating one Ovarium on the number of young produced, p. 233. Observations tending to shew, that the Wolf, Jackal, and Dog, are all of the same Species, p. 253. Observations on the Structure and Oeconomy of Whales, p. 371. Jackal, I. Jackal, Wolf, and Dog, observations tending to shew them to be of the same species, p. 253. Inks of the ancients, observations on, p. 451. Method of recovering decayed writings, p. 451. Intestines of Whales, p. 409. K. Keir, James, Experiments on the Congelation of the Vitriolic Acid, p. 267 Kidneys of Whales, p. 412. Köhler, Observations on the Transit of Mercury, May 4, 1786, p. 47. L. Lamb killed suddenly, p. 67. Lande, M. de la, errors in his tables, p. 38. Larynx of Whales, p. 416. Lauder, James, killed by thunder, p. 62. Light, effect of, in the production of dephlogisticated air, p. 91. Limbird, James, Strata of earth observed in sinking for Water at Boston, Lincolnshire, p. 50. Linens, ravelings of, power of extracting air from water, p. 98. Liver of Whales, p. 410. Logarithms, the principles and illustration of an advantageous method of arranging the difference of logarithms on lines graduated for the purpose of computation, p. 246. Longitude of Dresden, from observations on the transit of Mercury, May 4, 1786, p. 47. On the differences of, p. 212. Correction of the method for determining the longitude by the pole star, p. 468. Lungs of Whales, p. 418. M. Maclaurin, on some improvements in algebra by him, p. 81. Magnetism, experiments and observations, p. 6. Needle suspended to a chain of hair; a good way of trying the magnetism of bodies, p. 6. Of bodies best tried on a surface of quicksilver, p. 7. Directions for making experiments, p. 10. Effect of, on heated iron and steel, p. 12. Iron and steel lose some degree of strength by being heated, p. 15. Effect by decomposing the iron, p. 16. Observations on the variation of the needle, p. 22. Effect of the aurora borealis on magnets, p. 24. Manuscripts, Manuscripts, method of recovering the legibility of, p. 451. Maskelyne, Nevil, concerning the latitude and longitude of the Royal Observatory at Greenwich, with remarks on a memorial of the late M. Cassini de Thury, p. 151. Mercury, observation on the transit, May 4, 1786, at Dresden, p. 47. At St. Petersburg, p. 48. Observation of the right ascension and declination of Mercury out of the meridian, near his greatest elongation, Sept. 1786, p. 318. Meridian, difference of, between Greenwich and Paris, p. 180. Meteorological observations in Scotland, p. 61. Observations in 1786, p. 369. Micrometer, Equatorial, Improvements in, by Mr. Smeaton, p. 318. Midwifery, remarkable case of five children at one birth, p. 345. Proportion of twins to single births, p. 350. Instances of numerous births, p. 353. Moisture, on the quantity absorbed from the atmosphere by various substances under similar circumstances, p. 240. Moon, three volcanos in, p. 229. Observation on the Corona observed round it, p. 370. More, Samuel, Account of an Earthquake felt in the Northern Parts of England, p. 35. Mules, on their producing young, p. 253. N. Newton, Sir Isaac, on some improvement in algebra by him, p. 81. Nicholson, William, the Principles and Illustration of an advantageous Method of arranging the Difference of Logarithms on Lines graduated for the Purpose of Computation, p. 246. O. Oil of Whales, observations on, p. 391. Ovarium; on the effect of extirpating one ovarium upon the number of young produced, p. 233. P. Pappus, demonstration of propositions given by him, p. 75. Parhelia, seen in North America, 1771, p. 44. Paris, enquiry into the latitude of the Royal Observatory, p. 168. The mode proposed for determining the relative situations of the Royal Observatories of Greenwich and Paris, p. 188. Supplement, 465. Pendulums, effect of heat and cold on, p. 203. Use of in discovering the figure of the earth, p. 203. Pigs, experiment on the effect of one of the ovaria being extirpated, p. 236. Remarks on Hunter's experiments on the procreation of, p. 357. Platina, on the magnetism of, p. 7. Poplar, cotton, power of extracting air from water, p. 105. 110. Porpoise, number of vertebrae in, p. 383. Number of ribs, p. 383. Portuguese, called upon to measure two degrees of longitude near the Fort of Macapa, p. 224. Potatoes, power of extracting air from water, p. 121. Precepts made to the Royal Society, p. 458. Q. Quicksilver, the best surface for trying the magnetism of bodies, p. 8. Method of cleansing the surface of, p. 9. R. Rain, Register of, at Lyndon, at Rutland, South Lambeth in Surrey, and Selborne and Fyfield, Hampshire, in 1786, p. 368. Ramden, on his instrument for trigonometrical operations, p. 220. Refraction, tables of, should be made from the same instrument, by turning it to the North and to the South alternately, p. 180. Investigation of a method of allowing for refraction in astronomical observations, p. 318. Investigation of the effects of, p. 334. Rovato, Joseph da, Account of the Places where, and the Manner in which, Borax is produced, Italian, p. 301. English, p. 471. Roy, William, an Account of the mode proposed to be followed in determining the relative Situation of the Royal Observatories of Greenwich and Paris, p. 188. Supplement to the account, p. 465. Rumovsky, M., Observation of the Transit of Mercury, May 4, 1786, p. 47. Ruffia, Empress, called upon to measure two degrees of longitude in high Northern latitudes, p. 225. S. Satellites, account of two revolving round the Georgian planet, p. 125. Saturn, determination of the heliocentric longitude of the descending node, p. 37. Schouten, improvements in algebra by him, p. 81. Sense, organs of, in Whales, p. 425. Sight, organ of, in Whales, p. 437. Silk, raw, power of attracting and separating air from water, p. 84, 100, 108, 110. Smeaton, John, an Observation of the right Ascension and Declination of Mercury out of the Meridian, near his greatest Elongation, Sept. 1786, p. 318. Smelling, Sense of, in Whales, p. 428. Spermaceti, on the situation of, in Whales, p. 390. Spleen of Whales, p. 412. Stanhope, Charles Earl, Remarks on Mr. Brydone's Account of a remarkable Thunderstorm in Scotland, p. 130. Stomach, Stomach of the Whale, p. 407. Swartz, Olof, Description of the Chloranthus, a new Genus of Plants, p. 359. T. Teeth of Whales, p. 398. Telescope, Dollond's 9-feet refractor magnifies 104 times, p. 47. Use of a wire apparatus for, p. 55. Thermometer, register of, at Lyndon in Rutland, in 1786, p. 368. Thompson, Sir Benjamin, Experiments on the Production of dephlogisticated Air from Water with various Substances, p. 84. Experiments made to determine the positive and relative quantities of moisture absorbed from the atmosphere by various substances under similar circumstances, p. 240. Thorax of Whales, p. 414. Thunder-storm in Scotland, p. 61. Man and two horses killed, p. 62. Remarks on the account, p. 130. Time, methods of observing the astronomical differences of, p. 214. Tongue of Whales, p. 426. Trigonometry, an operation in, proposed by Gen. Roy, p. 188. U. Vegetables, power of extracting air from water, p. 99, 117. Vertebræ, in Whales, p. 383. In the Porpoise, p. 383. Vince, Samuel, on the Precession of the Equinoxes, p. 363. Vitriolic acid, experiments on the action of on steel and iron, p. 17. Experiments on the congelation of, p. 267. Volcanos, three observed in the moon, p. 229. Ureter of Whales, p. 413. W. Waddington, Margaret, case of her having five children at one birth, p. 346. Walker, experiments on the production of artificial cold, p. 282. Waring, Edward, on finding the values of algebraical quantities by converging series, and demonstrating and extending propositions given by Pappus and others, p. 71. Whales, observations on the structure and economy of, p. 371. Number of vertebrae in different species of, p. 383. Number of ribs, p. 383. Fins, p. 385. Flesh and muscles, p. 385. The tail, p. 386. The fat, p. 387. The skin, p. 394. Their mode of catching food, p. 397. Whalebone, p. 400. The intestines, p. 405. Proportion of the several parts, p. 407. Stomach, p. 407. Intestines, p. 409. Liver, p. 410. Food, p. 411. Spleen, p. 412. Kidneys, p. 412. Ureter, p. 413. Bladder, p. 413. Capsules renales, p. 413. Blood, p. 413. Thorax, p. 414. Heart, p. 414. Arteries and blood of, p. 415. Larynx of, p. 316. Lungs, p. 418. Blow-hole, p. 420. Brain, p. 423. Organs of Sense, p. 425. Organ of sight in, p. 437. Parts of generation, p. 441. Explanation of plates, p. 447. Whirlwind on the Tweed, p. 67. Wires, use of applying them to telescopes, p. 55. Wolf, Jackal, and Dog, observations tending to shew them to be of the same species, p. 253. A litter of puppies from a Pomeranian bitch by a Wolf, p. 255. Wollaston, Francis, Observations of Miss Herschel's Comet in August and September, p. 53. Wool, power of drawing air from water, p. 96. FROM THE PRESS OF J. NICHOLS.