Front Matter

The only official reprint authorized by The Royal Society of London PHILOSOPHICAL TRANSACTIONS, GIVING SOME ACCOUNT OF THE Present Undertakings, Studies, and Labours, OF THE INGENIOUS, IN MANY Considerable Parts of the WORLD. VOL. XLVI. For the Years 1749 and 1750. LONDON: Printed for C. Davis, Printer to the Royal Society, over against Gray's Inn-Gate in Holborn. M.DCC.LII. THIS XLVI Volume of the Philosophical Transactions concludes those publish'd by the late Cromwell Mortimer, M.D. Secretary of the Royal Society; the last Number being printed off just before his Death on the 7th of January 1752. I. A Letter from the Rev. Henry Miles D.D. & F.R.S. to Martin Folkes Esq; Pr. R.S. concerning Thermometers, and some Observations of the Weather. p. 1. II. An Account of the Case of a Clergyman's Lady, at Cottered near Baldock in Hertfordshire, who had a Stone under her Tongue, by Wm. Freeman Esq; F.R.S. p.5. III. An Account of Glasses of a new Contrivance, for preserving Pieces of Anatomy or Natural History in spirituous Liquors, by Claud. Nic. le Cat, M.D. F.R.S. Royal Demonstrator in Anatomy and Surgery at Roan. p. 6. & 88. IV. Observationes aliquæ astronomicae à Reve-rendo P.P. Suarez è S.J. in Paraquaria habitæ, et per D. Suarez M.D. cum Soc. Regali communicatæ. p. 8. The CONTENTS V. Observatio Eclipsis solaris Julii 14, et Lunæ Julii 28, 1748. Madirti habitæ à Domino Antonio de Ulloä R. S. S. p. 10. VI. Remarks on the principal Paintings found in the subterraneous City of Herculaneum, and at present in the Possession of the King of Naples; by ——— Blondeau Esq; communicated by Tho. Stack M. D. & F. R. S. p. 14. VII. An Account of a new invented arithmetical Instrument called a Shwan-pan, or Chinese Accompt-Table; by Gamaliel Smethurst. p. 22. VIII. Extract of a Letter from Benj. Heath Esq; to Peter Davall Esq; Secr. R. S. inclosing a Proposal for intirely removing the only real Defect in the lateral Operation for the Stone; by Mr. John Mudge Surgeon at Plymouth. p. 24. IX. An Account of the Locusts, which did vast Damage in Walachia, Moldavia, and Transilvania, in the Years 1747 and 1748; and of some Swarms of them, which, in the Months of July and August 1748. came into Hungary and Poland; by a Gentleman who lives in Transilvania. p. 30. The CONTENTS. X. A Letter from Mr. Henry Baker F.R.S. to the President, concerning some Vertebrae of Ammonitae, or Cornua Ammonis; communicated to Mr. Baker by the Rev. Dr. Miles F.R.S. p. 37. XI. The Case of Mr. Smith, Surgeon at Sudbury in Suffolk; the Coats of whose Stomach were changed into an almost cartilaginous Substance; communicated by the Rev. Mr. Murdock to Cromwell Mortimer M.D. Secret. R.S. p. 39. XII. A Catalogue of the Fifty Plants from Chelsea-Garden, presented to the Royal Society by the Company of Apothecaries, for the Year 1746. pursuant to the Direction of Sir Hans Sloane Bart. Med. Reg. & nuper Soc.Reg.Praef.; by Jof. Miller Apothecary, Hort.Chelf. Praef.ac Praelect. Botan. p. 43. XIII. The Reverend Mr. Robert Clarke to Mr. Fleming, concerning a Boy, who had a Calculus formed between the Glans and the Preputium. p. 45. XIV. The Establishment of a new Genus of Plants, called Salvadora, with its Description; by Laurence Garcin M.D. F.R.S. The CONTENTS. of Neufchatel in Switzerland; communicated in a Letter to Dr. Mortimer Secr. R. S. p. 47. XV. A State of the English Weights and Measures of Capacity, as they appear from the Laws as well ancient as modern; with some Considerations thereon; being an Attempt to prove that the present Avoirdepois Weight is the legal and ancient Standard for the Weights and Measures of this Kingdom; by Samuel Reynardson Esq; F. R. S. p. 54. XVI. A Letter from Dr. le Cat F. R. S. to C. Mortimer M. D. Secret. R. S. concerning the Cure of Dry Gangrenes; together with a Description of a new-invented Instrument for the Extirpation of Tumours out of the Reach of the Surgeon's Fingers. p. 72. PHILOSOPHICAL TRANSACTIONS. For the Months of April, May, and June, 1749. I. Viæ Cometarum, secundùm hypothesin quæ statuit illos cursu suo Parabolam circa Solem describere, per Nicolaum Struijk, R. S. Lond. S. p. 89 II. Epistola à Joh. Jacobo Hubero M. D. Med. & Consil. Reg. Suec. & Anatom. Prof. Cassel. ad Cromwell Mortimerum R.S. Secret. de Cadavere aperto, in quo non exstitit Vesica fellea; et de Sterno gibboso. p. 92 III. The Operation of Lithotomy on Women, by Mons. le Cat, M. D. & F.R.S. Translated from the French, by T. S. M. D. and F. R. S. p. 97 IV. De Barometrorum cum Aëris et Tempestatum mutationibus consensu: Auctore Sam. Christiano Hollmanno, Philos. in Acad. Gottingensi Profess. publ. ordin. et R. S. Lond. S. p. 101 The CONTENTS. V. A Letter from Captain John Waddell, to Mr. Naphthali Franks Merchant, concerning the Effects of Lightning in destroying the Polarity of a Mariners Compass; to which are subjoined some Remarks thereon, by Gowin Knight, M.B. F.R.S. p. 111 VI. A Letter from Sir Hans Sloane Baronet, late Pr. R. S. to Martin Folkes Esquire Pr. R. S. containing Accounts of the pretended Serpent-stone called Pietra de Cobra de Cabelos, and of the Pietra de Mombazza or the Rhinoceros Bezoar, together with the Figure of a Rhinoceros with a double Horn, from a Coin of Domitian. p. 118 VII. Some Account of the Rana Piscatrix; by James Parsons, M.D. F. R. S. p. 126 VIII. Observations on the Height to which Rockets ascend; by Mr. Benjamin Robins F. R. S. p. 131 IX. Extract of so much of Don Antonio De Ullöa's F. R. S. Account of his Voyage to South America, as relates to the Distemper called The CONTENTS. called there Vomito Prieto, or black Vomit. Translated from the Spanish by W. Watson F. R. S. p. 134 X. Declinationes quarundam Stellarum Australium primæ et secundæ magnitudinis, mense Junio 1738. cum methodo inveniendi horam in mari noctu, ex aspectu Crucis australis; per Dn. de la Condamine, Reg. Societ. Londin. & Acad. Reg. Scient. Paris. Socium. p. 139 XI. A Letter from Mr. Emanuel da Costa F. R. S. to the President, concerning two beautiful Echinites. p. 143 XII. The State of the Tides in Orkney; by Mr. Murdoch Mackenzie. p. 149 XIII. Some Account of the Remains of John Tradescant's Garden at Lambeth; by Mr. W. Watson F. R. S. p. 160 XIV. A Letter from the Rev. Mr. Richard Dunthorne to the Reverend Mr. Richard Mason F. R. S. and Keeper of the Woodwardian Museum at Cambridge, concerning the Acceleration of the Moon. p. 162 The CONTENTS. XV. Alberti Halleri, Archiatri Reg. Medicin. Prof. Gotting. & R. S. Lond. S. Fabricae morbosae in cadaveribus repertae historiae aliquae. p. 172 XVI. A Memoire on the Lacrymae Batavicae, or Glass-Drops, the Tempering of Steel, and Effervescence, accounted for by the same Principle. By Claud. Nic. le Cat, M. D. F. R. S. &c. Translated from the French, by T. S. M. D. p. 175 XVII. Extract of a Letter from Mr, Prof. Geo. Matthias Bose, of Wittemberg, to Mr. W. Watson, F. R. S. on the Electricity of Glass, that has been exposed to strong Fires. p. 189 June 15. the Society adjourned to Oct. 26. 1749. PHILOSOPHICAL TRANSACTIONS. For the Months of Octob. Nov. and Dec. 1749. I. A Description of an extraordinary Rainbow observed July 15, 1748. by Peter Daval, Esq; Secret. R. S. p. 193 II. A Letter from Mr. Henry Baker, F. R. S. to the President, containing an Extract of a Letter from Mr. William Arderon, F. R. S. to Mr. Baker, giving an Account of the present Condition of the Roman Camp at Caistor in Norfolk, with a Plan of it; and also a Representation of an Halo or Mock-Sun observed by the same Gentleman July 11, 1749. p. 196 III. Part of a Letter from Leonard Euler, Prof. Math. at Berlin, and F. R. S. To the Rev. Mr. Caspar Wetstein, Chaplain to his Royal Highness the Prince of Wales, concerning the gradual Approach of the Earth to the Sun. Translated from the French, by T. S. M. D. F. R. S. p. 203 The CONTENTS. IV. Part of a Letter from Mr. Benj. Cooke, F. R. S. to Mr. Peter Collinson, F. R. S. concerning the Effects of the Mixture of the Farina of Apple-Trees; and of the Mayze or Indian Corn: And of a Child born with the Jaundice upon it, received from its Father; and of the Mother taking the same Distemper from her Husband, the next Time of being with Child. p. 205 V. A Letter from the Rev. Henry Miles, D.D. and F. R. S. to Mr. Henry Baker, F. R. S. concerning a very cold Day, and another a very hot Day; in June and July 1749 and of the near Agreement of Thermometers in London and at Tooting. p. 208 VI. Account of a Bas-relief of Mithras found at York, explain'd by the Rev. Dr. Stukely, F. R. S. communicated to the Royal Society, by Mr. Francis Drake of York, F. R. S. p. 214 VII. Part of a Letter from James Mounsey, M. D. Physician to the Czarina's Army, to Mr. Henry Baker, F. R. S. concerning the Russian Castor, the Baths at Carlsbad, The CONTENTS. the Salt-mines near Cracau, and various other Notices. p. 217 VIII. The Case of a Lady, who was delivered of a Child, which had the Small-Pox appeared in a Day or two after its Birth; drawn up by Cromwell Mortimer, M.D. Secret. R.S. p. 233 IX. Some Accounts of the Fœtus in utero being differently affected by the Small Pox. By W. Watson, F.R.S. p. 235 X. The Case of Nicolas Reeks, who was born with his Feet turned inwards, which came to rights after being some time used to sit cross-legged. Transmitted from William Millner, Esq; at Poole, to Sir Peter Thompson, Knt. F.R.S. p. 239 XI. A Letter from Mr. James Short, F.R.S. to the President, with the Description and Uses of an Equatorial Telescope. p. 241 XII. An Eclipse of the Moon, observed at Mr. Graham's in Fleet-street, by John Bevis, M.D. and Mr. James Short, F.R.S. p. 247 XIII. An Account of an extraordinary Meteor seen in the County of Rutland, which resembled The CONTENTS. resembled a Water-Spout, communicated to the President by Tho. Barker, Esq.; p. 248 XIV. An Enquiry into the original State and Properties of Spar, and Sparry Productions, particularly the Spars or Crystals found in the Cornish Mines, called Cornish Diamonds. In a Letter to Emanuel Mendez da Costa, Esq; F. R. S. from the Rev. Mr. Wm. Borlace. p. 250 XV. A Description of the Great Black Wasp, from Pensilvania, as communicated from Mr. John Bartram to Mr. Peter Collinson, F. R. S. p. 278 XVI. An Observation of an Eclipse of the Moon, Dec. 12. 1749. made at Earith, near St. Ives, in Huntingdonshire, by Mr. Wm. Elstobb, jun. communicated in a Letter to Martin Folkes, Esq; Pr. R. S. p. 280 XVII. A Catalogue of the Eclipses of Jupiter's Satellites for the Year 1751. by James Hodgson, F.R.S. and Master of the Royal Mathematical School in Christ's-Hospital, London. p. 282 XVIII. A Letter from the Widow of the late Mr. John Senex, F. R. S. to the President, concerning his large Globes. p. 290 PHILOSOPHICAL TRANSACTIONS. For the Months of January, February, March, and Part of April, 1750. I. Remarks upon an antient Roman Inscription, found in that Part of Italy, which formerly belonged to the Sabines; and now in the Possession of Richard Rawlinson, LL.D. & F.R.S. By Mr. John Ward, Prof. Rhet. Greb. & F.R.S. p. 293. II. Epistola a Rev. Patre P. Augustino Hallerstein, S. J. M. Collegii Astronomici Pekinensis Praefide, ad Cromwell Mortimer, M. D. Secret. R. S. missa, una cum Observationibus Cometæ visi Pekini 1748. Novæ Constellationis; Occultationis Mattis et Lunæ Dec. 6. 1747. Conjunctionis Martis et Veneris mensæ Martio 1748. & Congressus Jovis & Veneris Jan. 1. 1748. ibidem quoque factis. p. 305. III. Observatio Cometæ, Anno 1748. cum aliis aliquot Observationibus astronomicis a Rev. P. P. Antonio Geubil e Soc. Jesu ad eundem transmissa; in Residentia PP. Gallor. Soc. Jesu Pekini. p. 316. IV. An Account of an Aurora Australis, seen Jan. 23. 1749 at Chelsea, by John Martyn, F.R.S. Prof. Bot. Cantab. communicated by Martin Folkes, Esq.; Praef. Reg. Soc. p. 319. The CONTENTS. V. A Letter from Mr. Christopher Maire to the President, containing Observations made at Rome of the Eclipse of the Moon, Dec. 23, 1749; and of that of the Sun, Jan. 8, 1750. p. 321. VI. Some Observations on the Dragon-Fly or Libella of Pennsylvania, collected from Mr. John Bartram's Letters, communicated by Peter Collinson, F. R. S. p. 323. VII. Alberti Halleri Archiatri & Consil. Aul. Reg. Medic. in Acad. Gottingen. Prof. & Reg. Soc. Lond. Sodal. Experimenta aliquæ ad Respirationem pertinentia. p. 325. VIII. A Letter from Father Anthony Gaubil, Jesuit, to Dr. Mortimer, Sec. R. S. containing some Account of the Knowledge of Geography among the Chinese, and of Paper-Money current there. Translated from the French by T. S. M. D. and F. R. S. p. 327. IX. A Catalogue of the Fifty Plants from Chelsea Garden, presented to the Royal Society by the worshipful Company of Apothecaries, for the Year 1747, pursuant to the Direction of Sir Hans Sloane, Bart. Med. Reg. & Soc. Reg. nuper Praef. by John Wilmer, M. D. Hort. Chels. Praefect. et Praelect. Botan. p. 331. X. A Letter from the Rev. Henry Miles, D. D. and F. R. S. to Mr. Henry Baker, F. R. S. concerning the green Mould on Fire-Wood; with some Observations of Mr. Baker's upon the Minuteness of the Seeds of some Plants. p. 334. XI. An Observation of the Eclipse of the Sun on Jan. 8, 1750. N. S. taken at the Observatory at Berlin, The CONTENTS. Berlin, by M. Grifcow jun. and M. Kies. Translated from the French. p. 339. XII. Alberti Halleri, Archiatri et Consil. Aul. Reg. in Acad. Gottingensi Medicinæ Prof. necnon R. S. Lond. Sodalis, Observationes de Viis Seminis. p. 340. XIII. A Letter from John Martyn, M. D. Prof. Botan. Cantab. & F. R. S. to the President, concerning an Aurora Borealis seen February 16. 1749-50. p. 345. XIV. A Letter from the Rev. Henry Miles, D. D. and F. R. S. to Henry Baker, F. R. S. concerning an Aurora Borealis seen Jan. 23. 1750-51. p. 346. XV. A Letter from Mr. William Watson, F. R. S. to the Royal Society, declaring that he as well as many others have not been able to make Odours pass thro' Glass by means of Electricity; and giving a particular Account of Professor Bose at Wittemberg his Experiment of Beatification, or causing a Glory to appear round a Man's Head by Electricity. p. 348. XVI. Part of a Letter from Mr. Professor Euler to the Reverend Mr. Wetstein, Chaplain to his Royal Highness the Prince, concerning the Contraction of the Orbits of the Planets. Translated from the French by T. S. M. D. and F. R. S. p. 356. XVII. A Catalogue of the fifty Plants from Chelsea Garden, presented to the Royal Society, by the worshipful Company of Apothecaries for the Year 1748, pursuant to the Direction of Sir Hans Sloane, Bart. Med. Reg. et Societat. Reg. nuper Praef. The CONTENTS. Pref. by John Wilmer, M.D. Clariss. Societar. Pharmaceut. Lond. Soc. Hort. Chelsea. Praefect. et Praelect. Botan. p. 359. XVIII. An Account of a surprising Inundation in the Valley of St John's near Kelwick in Cumberland, on the 22nd Day of August 1749, in a Letter from a young Clergyman to his Friend; communicated by John Lock, Esq; F.R.S. p. 362. XIX. An Account of an extraordinary Fire-ball bursting at Sea, communicated by Mr. Chalmers. p. 366. XX. Extract of a Letter from the Abbé Nollet, F.R.S. &c. to Charles Duke of Richmond, F.R.S. accompanying an Examination of certain Phænomena in Electricity, published in Italy; by the same, and translated from the French by Mr. Watson, F.R.S. p. 368. XXI. An extraordinary Case of a Fracture of the Arm; communicated by Mr. John Freke, F.R.S. Surgeon to St. Bartholomew's Hospital. p. 397. XXII. A further Account of the Libellæ or May-Flies, from Mr. John Bartram of Pennsylvania; communicated by Mr. Peter Collinson, F.R.S. p. 400. I. Remarks PHILOSOPHICAL TRANSACTIONS. For the Months of April, May, June, and July, 1750. I. A Catalogue of the fifty Plants from Chelsea Garden, presented to the Royal Society, by the worshipful Company of Apothecaries for the Year 1749. p. 403 II. A Letter from Daniel Peter Layard, M.D. and F.R.S. to Dr. Mead, containing an Account of the Case of a young Lady who had an extraordinary Impostume formed in her Stomach. p. 406 III. An Account of an irregular Tide in the River of Forth, by Mr. E. Wright. p. 412 IV. The Case of a Tumor growing on the Inside of the Bladder, successfully extirpated by Mr. Joseph Warner, Surgeon to Guy's Hospital. p. 414 V. Remarks upon the Solar and the Lunar Years, the Cycle of 19 Years, commonly called the Golden Number, the Epact, and a Method of finding the Time of Easter, as it The CONTENTS. it is now observed in most Parts of Europe. By the Right. Hon. George Earl of Macclesfield F.R.S. p. 417 VI. An Account of the Morbus Strangulatiorius, communicated in a Letter from John Starr, M.D. to C. Mortimer, M.D. Secret. R.S. &c. p. 435 VII. An Examination of the Strength of several of the principal purging Waters, especially of that of Jessop's Well; by the Rev. Stephen Hales D.D. & F.R.S. communicated in a Letter to Cromwell Mortimer M.D. Secr. R.S. with a Letter from Swithin Adee M.D. F.R.S. to Dr. Hales, on the Virtues of the said Well. p. 446 VIII. An abstract of a Discourse intitled, Reflexions on the Medals of Pescennius Niger, and upon some Circumstances in the history of his Life; written in French by Mr. Claude Gros de Boze, keeper of the Medals in the French King's Cabinet, &c. and sent by him to Dr. Mead, who communicated it to this Society. By John Ward, Rhet. Prof. Gresh. & F.R.S. p. 452 IX. A Letter from Robert More Esq; to the President, containing several curious Remarks in his Travels through Italy. p. 464 The CONTENTS. X. Extract of Letter from Mr. William Arderon F. R. S. to Mr. Henry Baker F. R. S. containing an Account of a Dwarf; together with a Comparison of his Dimensions with those of a Child under four Years old; by Mr. David Erskine Baker. p. 467 XI. Part of a Letter from Robert More Esq; to Mr. W. Watson F. R. S. concerning the Method of gathering Manna near Naples. p. 470 XII. A Letter from John Huxham M. D. F. R. S. to C. Mortimer M. D. Secr. R.S. containing Observations on the Northern Lights, seen Feb. 15 and 16, 1749-50. p. 472 XIII. A Letter from John Starr M. D. to John Huxham M. D. F. R. S. containing an Account of an Horse bit by a mad Dog. p. 474 XIV. Descriptio Fœtus monstrofi sine ullo Sexûs Signo, cum Regali Societate communicata per Job Baster, Acad. Cæsar. et Reg. Soc. Lond. Soc. p. 479 XV. Some Experiments on Substances resisting Putrefaction; by J. Pringle M. D. p. 480 XVI. An attempt to explain an antient Greek Inscription, ingraven upon a curious bronze cup The CONTENTS. cup with two handles, and published with a draught of the cup by Dr. Pococke, in his Description of the East, Vol. II. Part 2. pag. 207. By John Ward, Prof. Rhet. Grefb. and F. R. S. p. 488 XVII. A Letter from Mr. Henry Baker F. R. S. to the President, containing Abstracts of several Observations of Auroræ Boreales lately seen. p. 499 XVIII. A Description of a Mariner's Compass, contrived by Gowin Knight M. B. F. R. S. p. 505 XIX. An Account of some Improvements of the Mariners Compass, in order to render the Card and Needle, proposed by Doctor Knight, of general Use, by John Smeaton, Philosophical Instrument-maker. p. 513 XX. The Description of a Fish, OPAH Guinien-sium, shewed to the Royal Society by Mr. Ralph Bigland. p. 518 XXI. A Letter from John Burton M. D. to C. Mortimer M.D. & Secr. R. S. concerning the Extirpation of an Excrecence from the Womb. p. 520 PHILOSOPHICAL TRANSACTIONS. For the Months of November and December, 1750. The CONTENTS. I. An Account of the Eclipse of the Moon, June 8, 1750. observed in Surry-street in the Strand; by Mr. John Catlin and Mr. James Short, F. R. S. Likewise an Observation determining the Longitude of Kingston in Jamaica. p. 523 II. A Continuation of the Experiments on Substances resisting Putrefaction; by John Pringle M. D. F. R. S. p. 525 III. A Letter from Mr. Joseph Platt to Mr. Peter Collinson F. R. S. concerning a flat Spheroidal Stone having Lines regularly crossing it. p. 534 IV. A Letter from Arthur Dobbs Esq; to Charles Stanhope Esq; F. R. S. concerning Bees, and their Method of gathering Wax and Honey. p. 536 The CONTENTS. V. Further Experiments on Substances resisting Putrefaction; with Experiments upon the Means of hastening and promoting it; by John Pringle M.D. F.R.S. p. 550 VI. A Letter from Mr. John Robertson to the President, containing an Explanation of the late Dr. Halley's Demonstration of the Analogy of the Logarithmic Tangents to the Meridian Line, or Sum of the Secants. p. 559 VII. Observatio Eclipseos Lunaris totalis cum mora, habita Wittembergæ, 1750. die 19 Junii, tubo 6 ped. pro correctione horologii, quadrante telecopico 18 digitorum, altitudin. Solis correspondent. die 19 Junii, per G. M. Bose, Physic. Prof. Wittembergæ, &c. p. 570 VIII. Two Letters from the Rev. Henry Miles F.R.S. D.D. to Mr. Henry Baker F.R.S. concerning the Heat of the Weather in July and September last. p. 571 IX. Extract of a Letter from Mr. William Arderon F.R.S. to Mr. Henry Baker F.R.S. concerning the hot Weather in July last. p. 573 The CONTENTS. X. A total Eclipse of the Moon, observed Dec. 2. 1750. in the Morning, in the Strand, London, about 5' of Time West of St. Paul's, and 27' West of the Royal Observatory at Greenwich; by Dr. Bevis and Mr. James Short F. R. S. p. 575 XI. An Account of some Experiments, made by Benjamin Robins Esq; F. R. S. Mr. Samuel DaCosta, and several other Gentlemen, in order to discover the Height to which Rockets may be made to ascend, and to what Distance their Light may be seen; by Mr. John Ellicott F. R. S. p. 578 XII. Several Papers concerning a new Semi-Metal, called Platina; communicated to the Royal Society by Mr. Wm. Watson F. R. S. p. 584 XIII. An Account of a very large human Calculus, by William Heberden M. D. F. R. S. and Fellow of the College of Physicians, London. p. 596 XIV. A Letter from the Rev. Charles Lyttelton LL.D. and F. R. S. Dean of Exeter, to the President, concerning a nondescript petrified Insect. p. 598 XV. The CONTENTS. XV. Some further Account of the before-mention'd petrified Insect, by the Editor of these Transactions. p. 600 XVI. The Description and Figures of a small flat spheroidal Stone, having Lines formed upon it; by C. Mortimer, M.D. & Secret. R. S. p. 602* Printed for C. Davis, Printer to the Royal Society, over-against Gray's-Inn-Gate in Holborn. M.DCC.LI. PHILOSOPHICAL TRANSACTIONS. BEING An APPENDIX to those for the Year 1750. Consisting of a Collection of several Papers laid before the Royal Society, concerning several Earthquakes felt in England, and some neighbouring Countries, in the Year 1750. The CONTENTS. I. Mr. H. Baker F. R. S. to Martin Folkes Esq; President of the Royal Society, concerning the Earthquake felt at London Feb. 8, 1749-50. p. 601 II. An Account of the Shock of an Earthquake, felt Feb. 8. 1749-50: By Gowin Knight M. B. & F. R. S. p. 603 III. An Account of the same, by Jo. Freeman Esq; F. R. S. p. 605 IV. An Account of the same, by Wm. Fauquier Esq; F. R. S. ibid. V. The Rev. Henry Miles D. D. F. R. S. to Mr. H. Baker F. R. S. on the same. p. 607 VI Jo. Martyn M.D. to the Pres. concerning the same. p. 609 [a] VII. The CONTENTS. VII. Extract of a Letter from Mr. Trembley F.R.S. to the Pres. concerning the same. p. 610 VIII. Smart Lethieullier Esq; F. R. S. to the President, of the burning of the Steeple of Danbury in Essex, by Lightning, and of the Earthquake. p. 611 IX. The President's Account of the Earthquake at London, March 8. p. 613 X. An Account of the same, by the Rev. Mr. Tho. Birch F. R. S. p. 615 XI. Mr. H. Baker F. R. S. to Martin Folkes Esq; Pres. of the Royal Soc. concerning the same. p. 617 XII. To Mr. H. Baker F. R. S. of extraordinary Heat in Feb. and of the same Earthquake. p. 619 XIII. M. Clare Esq; F. R. S. to C. Mortimer M. D. & Secr. R. S. of the same. p. 620 XIV. D. P. Layard M. D. & F. R. S. to the President, concerning the same. p. 621 XV. The Reverend Mr. R. Pickering, F. R. S. to the President, concerning the same. p. 622 XVI. An Account of the Earthquake on Thursday Morning, March 8, 1749, as seen in the Inner Temple Garden, by Robert Shaw; communicated by James Burrow Esq; F.R.S. p. 626 XVII. The CONTENTS. XVII. The Rev. H. Miles D. D. F. R. S. to Mr. H. Baker F. R. S. containing a more full Account of the same than his former Letter, Art. XII. p. 628 XVIII. J. Martyn M. D. F. R. S. &c. to the President, concerning the same. p. 630 XIX. Michael Russel, Esq; F. R. S. to the President, concerning the same. p. 631 XX. James Parsons M.D. F.R.S. to the President, concerning the same. p. 633 XXI. An Account from J. Burrow Esq; F.R.S. of what Mr. Boyfield told him concerning the late Earthquake. p. 637 XXII. Observations on the Earthquake, March 8. 1749. by C. Mortimer, M. D. Secr. R. S. p. 638 XXIII. The Rev. H. Miles, D. D. & F.R.S. to the President, containing some additional Observations to his former Accounts. p. 639 XXIV. The Rev. W. Stukely M.D. & F. R. S. to the President, on the Causes of Earthquakes. p. 641 XXV. Extract of a Letter to Mr. J. Ellicott: F.R.S. concerning an Earthquake at Portsmouth, March 18. 1749-50. p. 646 [a 2] XXVI. The CONTENTS. XXVI. Extract of a Letter from Portsmouth; communicated by Daniel Wray Esq; F.R.S. concerning the same. p. 647 XXVII. The Rev. W. Cooper, D.D. Dean of Durham, to the President, of the Earthquake on March 8. and of the luminous Arch, February 16. 1749. ibid. XXVIII. Extract of a Letter from the Rev. Mr. Taylor, Vicar of Portsmouth, to Mr. Roderick, concerning an Earthquake felt there, March 18. 1749-50. p. 649 XXIX. Extract of a Letter from Mr. Benj. Cooke F. R. S. to Mr. P. Collinson F.R.S. of a Shock of an Earthquake felt in the Isle of Wight, March 19. 1749-50. p. 651 XXX. Extract of a Letter from a Gentleman at Southampton to Josiah Colebrooke, Apothecary, F. R. S. of the Shocks felt in those Parts, March 18 and 19. 1749-50. p. 652 XXXI. A Letter from Mr. Peter Newcome F. R. S. to the President, concerning the same Shock being felt at Hackney, near London. p. 653 XXXII. A Letter from James Burrow Esq; F. R. S. to Peter Daval Esq; Secr. R. S. concerning the same Earthquake being felt at The CONTENTS. at East Sheen, near Richmond Park in Surrey. p. 655 XXXIII. The Rev. W. Stukely M.D. F.R.S. to the President, concerning the Causes of Earthquakes. p. 657 XXXIV. Some Considerations on the Causes of Earthquakes. By the Rev. Stephen Hales, D.D. and F.R.S. p. 669 XXXV. The President's Report of the Account given him by Tho. Burrat, of Kensington, concerning the Earthquake on March 8. last past. p. 681 XXXVI. Extract of a Letter from Chester, concerning an Earthquake felt there April 2. 1750. communicated by Robert Paul Esq; F.R.S. p. 683 XXXVII. A Letter from the Rev. Stephen Hales D.D. & F.R.S. to the President, serving to inclose a Letter to him from W. Bowman Esq; concerning an Earthquake felt at East Molesey in Surry, on March 14. 1749-50. p. 684 XXXVIII. Abstract of a Letter from Mr. Pennant to Rich. Holford Esq; Master in Chancery, of an Earthquake felt in Flintshire, on April 2. 1750. p. 687 XXXIX. The CONTENTS. XXXIX. The Postscript of a Letter from Mr. Nath. Downe to the Hon. Mr. Greenville, concerning an Earthquake felt at Bridport, on March 18. 1749-50. p. 688 XL. Mr. H. Baker F.R.S. to the President, concerning an Earthquake felt at Wimbourn in Dorsetshire, May 4. 1749. and of another at Taunton in Somersetshire, July 1. 1747. p. 689 XLI. Part of a Letter from M. de Reaumur F.R.S. to the President, concerning an Earthquake felt in France, October 11. 1749. p. 691 XLII. The Rev. Mr. Wm. Barlow to the Pres. concerning a Shock of an Earthquake felt at Plymouth, about One o' Clock in the Morning, between the 8th and 9th of Feb. 1749-50. p. 692 XLIII. A Letter from Mr. Ph. Warburton to the President, serving to inclose an Extract of a Letter from the Rev. Mr. J. Seddon, of Warrington in Lancashire, to Mr. Jo. Philpot, in Chester, concerning an Earthquake, April 2. 1750. p. 695 XLIV. Mr. H. Baker F.R.S. to the President, containing an Extract of a Letter from Mr. W. Arderon R.S. concerning an Explosion The CONTENTS. Explosion in the Air, heard at Norwich, June 7. 1750. p. 698 XLV. An Account of Part of a Roof of a Pot-house at Lambeth being flung down by the Earthquake, March 8. 1749-50. p. 700 XLVI. Extract of a Letter from Dr. MacKenzie to Dr. Mead F. R. S. concerning Earthquakes at Smyrna. ibid. XLVII. Part of a Letter from Wm. Folkes, Esq; F. R. S. to his Brother the Pres. concerning a Shock of an Earthquake felt at Newton in Northamptonshire, on Sunday, September 30. 1750. p. 701 XLVIII. Part of a Letter from J. Burrow, Esq; F. R.S. to the President, concerning an Earthquake felt near Bury St. Edmund's in Suffolk, and another at Narborough in Leicestershire, on the 30th of September, 1750. p. 702 XLIX. A Letter from the Rev. Mr. J. Nixon, F. R. S. to Mr. John Ward, F. R. S. and Rhet. Prof. Gresham. serving to accompany two Letters; one from Sir Thomas Cave, Bart. and another from the Minister of Weston with Sutton in Northamptonshire; concerning the Earthquake on Sept. 30. 1750. p. 705 The CONTENTS. L. A Letter from the same to the Pr. R. S. containing further Particulars of the same Earthquake. p. 710 LI. A Letter from the Rev. P. Doddridge D.D. to Mr. H. Baker F R. S. containing some Account of the late Earthquake felt at Northampton. p. 712 LII. An Account of the Earthquake which happen'd September 30. 1750. by Mr. —— Steward to the Earl of Cardigan. p. 721 LIII. Extract of a Letter from Mr. H. Green to Mr. J. Ayshcough, Optician, relating to the Earthquake felt Sept. 30. 1750. p. 723 LIV. Extracts of Letters from M. Johnson, Esq; and from J. Green Esq; to Emanuel Mendez da Costa, Esq; F. R.S. concerning an Earthquake felt Aug. 23. 1750. p. 725 LV. Part of a Letter from the Rev. H. Miles, D. D. to Mr. H. Baker, concerning the Earthquake felt on Sept. 30. 1750. p. 726 LVI. A Letter from the Rev. Mr. J. Nixon, F. R.S. to the President; and a Letter from Mr. W. Smith to Mr. Nixon, giving a very particular Account of the Earthquake felt on Sept. 30. 1750. p. 727 LVII. The Philosophy of Earthquakes; by the Rev. W. Stukeley, M. D. F. R.S. in a Letter to the President. p. 731