PHILOSOPHICAL

TRANSACTIONS.

VOL. XLVIII. PART I.

PHILOSOPHICAL TRANSACTIONS,

GIVING SOME

ACCOUNT 0 F THE

Prefent Undertakings, Studies, and Labours,

0 F THE

INGENIOUS, IN MANY

Confiderable Parts of the W O R L D.

VOL. XLVIII. PART I. For the Year 1753.

LON 'DON:

Printed for C. DA v Is, PRINTER to the Ro YA L SocIETY, over-againfl Gray.'s-lnn-Gate in Holbourn.

M. DCC. LIV,

PHILOSOPHICAL

TRANSACTIONS.

The CONT ·EN TS. p ART I. VOL. XLVIII.

I. An Account of an extraordinary Stream of Wind, whifh jhot thro' Part of the Parijhes ofTermono­mungan and Urney, in the County of Tyrone, Oll:ober I I, 17;2. by Wm. Henry, 'D. 'D. Re[lor ~f' the Parijh of Urncy: Communicated kr the Right Hon. the Lord Cadogan, F. R. S. Page I.

II. An Account of a Book, intitled, P. D. Pauli Frifti Mediolanenfis, &c. Difquifitio mathematica in cau­fam phyficam figurx et magnitudinisTclluris nofhx; printed at Milan in 17;2. inftribed to the Cottnt de Sylva: by Mr. James Short, F. R. S. p. 5.

Ill. A Letter from the Rev . .Nlr. George Coftard, Fellow of Vil adham-Collcge, Oxford, to Dr. Bevi5, concerning the Tear of the Eclipfe foretold by Thales. p. I 7.

IV. An .Account of the Cafe of Anne Elizabeth Queriot, of Paris, whofe Bones were diftorted and .foftened; by Ambrofc Hoity, ft!. 'D. of the Fa-culty of Pat is. p. 26.

V. An Account of a Roman altar, with an injcri­ption upon it, j ound in April lajl at York, and communicated to the Society of Antiquaries by Mr. Francis Drak:e, F. R. S. As aljb a breif expli ­cation of the infcription b7 John \Vard., LL.V.

a Profajjor

C ONT ENT S. Prqfejfor of Rhetoric in Grdham-College, and , V. P.R. S. P· 33·

VI. An Account of.[everel Perfons Jei'zed with the Goal-Fever, ~·or king in Newgate; and of the Man­ner, in which the lnjec1ion was communicated to one intire Fa1ti1ly; by John Pringle, M. 'D .. F.R.S.

p. 42. Vll. An Account of the great Alterations, which,

the fftands of Sy lley have undergone fince the 'I'ime of the Antients, who mention them, as to their Number, Extent, and Pojition: In a Let­ter to the Rev. Tho. Birch, 'D. 'D. Sec. R. S. by the Rev. Mr. \V m. Borlafr, M.A. F. R. S. p. ;,.

VIII. An Account of Mr. Appkby's Procejs to make Sea-lf'"ater jrejh; with Jome Experiments therewith; communicated to the Royal Society,

by Mr. \V m. Watfon, F. R. S. p. 69.

IX .. Extraft qf a Letter from Signor Carnillo Pa­dcrni, to 'Dr. Mead, concerning the Antiquities dug up from the antient Herculaneum, datedfrom· Naplts, Nov. 18, 17 J2. Tranflattd from the

Italian. p. 7 1.

X. A TranJlation and Explanation of Jome Articles of the Book intitled. Theorie de la Figure de la

Terre; by frfonf Clairaut, of the Royal Academy

of Sciences at Paris, and F. R. S. p. 73. XI. An Account of a Storm of Thunder and Light­

ning, near Ludgvan in Cornwall, in a Letter jrom the Rev. Mr. Wm. Borlafe, M /1. F. R. S. to tht Rev. 'Dr. Lyttclton,, 'Dean of Exerer. p. 86.

XII. A fecond Letter of the Rev. \Vm. Henry, 'D. D. to the Right Honourable the Lord Cado­gan, F. R. S. concerning the Copper Springs in the Cotmty of Wicklow in Ireland. p. 94.

X.II.

CONTENTS .. XIII, The Conflru[/ion of the logarithmic lines

on the Gunter's Scale; by Mr. John RobcrtCon, F. R. S. p. 96.

XIV. A Letter frbm .711r. John DollonJ to ldr. James Short, l!~ R. S. concerning an Impro-ve­ment qf refrall:ing Tclefcopes. p. 103.

XV. An Extra[! from the thermometrical O/Jj'crva­tions made by Monf Demidoff at Solikamsky on the Borders of Siberia, Latif. 59, in the Tear 17;-r, by a Therm()lneter adapted to Mon(. De l'Hk's Scale, which, in this Extracl, are redttced liktwife to thqfe of Fahrenheit and Monf Rcau­mur j 6y the Right Hon. George Eart o/Maccles­fidd, Pr. R. S. after p. 107.

XVl. A Comparifon of different therrnometrical Ob­Jervations in Sibiria, by lvlr. \V. \Vatfon, F. R. S.

p, 108.

XVII. A Catalogue of the Fifty Plants from Che.Ifra Garden, prefented to the Royal Society, kY the

. worjhipful Company of .Apothecarin for the Tear 17;2, purjl!ant to the Dire[/ion of Sir Hans Sloane, Baronet, Med. Reg. & Soc. Reg. m,ptr Prttfes, by John Wilmer, M. 'D. Societat. Phar­maceut. Lond. Soc. Hort. Chelf. Prttfefi. et Prte!ea. Botanic. . P· I Jo.

XVIII. Objervations on a remarkable Coralline, in a Letter from Mr. John Ellis to the Rev. Tho. Birch, D. D. Sec. R. S. p. 11 5.

XIX. An Accol!nt of Jome uncommon foffil llodit~, 6y Mr. Henry Baker, F. R. S. p. r 17.

XX. An abflra[l of a Difcoztrje intitled, The hi!lory of the emperor TetriC!!s, cxplarncd and illufirated by medal~; 'i.lriten in French by lvfr. Claude Gros

a 2 de

CONTENTS. · de Boze, keeper of the medals in the French

f(ing's cabinet, etc. and Jent by him to Dr. Mead, · to be communicated to this Society. · By John . Ward, LL.CD. Rhet. Prof. Grejb. and V. P.R. S. - P· I 24.

XXI. An Account of aTreatife,prefentedto the Royal Society, intituled, Flora Sibirica, ftve hifioria plan­tarum Sibirix, tomus fecundus, extraEled and tran.flated from the Latin of Proftjlor Gmelin, by

. Mr. Wm. Watlon, F. R. S. p. 141.

XXII. A Letter to Mr. Willi~m Watfon, F.R.S. from Mr.Philip Miller,F.R.S;concerning a Miflake of Profejfor.Gmelm, concerning the Sphondylium vulgare hirfutum of Cafpar Bauhin. p. 153.

XXIII. A Letter from the Rev. }dr. George Co­fiard to ,Dr. Bevis~ concerning an Eclipfe mention'd 1,y Xenophon. p. I 5;.

'.XXIV. A 'Dejcriftion of a new Method of opening the Cornea, in order to extra[! the cryfralline Humour; by Mr. Samuel Sharp, Surgeon to Guy's Hofpiral, and F. R. S. p. 161.

XXV. Experiments by Francis Hume, M. 'D. on Fi!h and Fle{b pr~/erved in Lime-water; commu­nicated by John Ckphane, M. 'D. F.R.S. p'. 163.

XXVI. .A Letter from Mr. James Short, F. R. S. to the Right Hon. the Earl of Macclesfield, Pre­fiaent, concerning a Paper of the late Servington Savery, Ejq; relating to his Invention of a new Micrometer. p. 16s.

XXVII. A 'Defcrittion of a Contrivance for mea­faring [malt Angles, hy Mr. John Dollond; com­mrmicated by Mr. James Short, F. R. S. p. 178.

XXVllI. A Letter to Sir Peter Thompfon, Knt. F. R. S. containing Experiments on the Copper­

Springs

CONTENTS. Springs in Wicklow in Ireland, and Obfervations thereon, by John Bond, M. 'D. p. 181.

XXIX. A Letter from 'Dr. Bevis to Mr. James Short, F. R. S. concerning Mr. Gafcoigne' s In­vention of the Micrometer. p. I 90.

XXX. Obfervations of the Tran/it of Mercury over the Sun, May 6, 1753; b; Mr. J. Short, F.R.S.

P· I 92. XXXI. An Account of a Treatife prefented to the

Royal Society, intituled, '' Letters concerning " Electricity, &c. by the Abbe Nollet:" ex­trailed and tranflated from the French, hy Mr. W. Watfon, F. R. S. p. 201.

XXXII. The Number of People in the C#1 ofBriflol. calculated from the Burials for Ten Tears /uccef­jive, and alfo from the Number of Houjes; bJ John Browning, Efq; communicated by H. Baker, F. R. S. p. 217.

XXXIII. An Account of the Eclipfe predi[fed ~y Thales; by the Rev. W. Stukely, M 'D. p. z:u.

XXXIV. An further Accotmt of the Giant's Caufc­way in the Cotmty of Antrim z'n Ireland, by the Rev. Richard Pococke, LL.V. Archdeacon of Dublin, and F. R. S. p. 226.

XXIV • .A Letter upon the fame Su~jell from the Re-v. Richard Pococke, LL.'D. Archdeacon of Dublin, to Tho. Birch, 'D. 'D. Sec. R. S. p. 238.

XXXVI. .A. View of the Relation between the cele­brated Dr. Halley's Tables, and the Notions of Mr. De Buffon, for eflablijbing a Rule for the probable 'Duration of the Life of Man; by Mr. William Kerfieboom, of the Hague. 'Iranjlated

from the French by J. Parfons, M. 'D. F. R. S. p. 239.

XXXVII.

C ONT EN TS. XXXVII. .A Letter from Father d'Incar,·illc, of

the Society of Jcfus, at Peking in China, to the late Cromweil Monimer,M D. R: S. Seer. p. 2 ;3.

}{XXVIII . .A Letter from A1r. T. Melvil to the Rev. James Bradley, 'D. D. F. R.S. With a 'DiJcou~fa concerning the Caufe of the different Rcfrangibi­lity of the Rays of Light. p. 261.

XXXIX. The Cafe of the Operation for the Empye­ma,_(ucce/rji,l!y performed ~Y Mr. Jofeph WarnerJ F. R. S. and Surgeon to Guy's Hofpital. p. z70.

XL. Extract of a Letter from Mr. James Dodfon to fair. William Mountainc, F. R. S. p. 273.

XLI. A Letter from John Lining, /rf. D. of Charles­Town, South-Carolina, to the Rev. Tho. Birch, 'IJ. V. Seer. R. S. concerning the f2.J.tantitJ of Rain fallen there from January I 7 3 8, to Drcem­bcr 17;2. p. 284.

XLII. .A Letter from Mr. Emanuel Mendez da Colla, F. R. S. to the Rev. Tho. Birch, D. D. Ster. R. S. concerning the Foffil, found at Dudley

· in Staffordfhire, and defcribed in Phil. T ranfact. N. 496. p. 286.

XLIII. Letters relating to a Theorem of 1'vlr. Euler, of the Royal Academy of Sciences at Berlin, and F. R. S. for correlling the Aberrations in the OlJ­Jelr-Glafies efrefracling Telc_[copes. p. z 87.

XL[V. A rumark.ab!e Cafe of Fragiliry, Flexibility, and Diffolution, of the Bones; communicated by John Pringtc, M. 11. F. R. S. p. z97.

XLV . ./ljtrono.mit:al Obfer·vations, made in. Surry­, fin:et, Londo~, by ]. Bevis, M. V. and J. Short,

A.M. F.R.J. p. 3or. XLVI. A Let/fr from Mr. John Ellis to Afr. Peter

Collinfon,.

CONTENTS. Collinfon, F. R. S. concerning a Clufler-Polypc, found in the Sea, near the Coafl of Greenland.

p. 30;. XLVII. Extralls of Two Letters from Father

Gaubil, qf the Society of Jefus, at Peking i1i China. Tranjlated from the French. p. 309.

XLVIII. .A Letter of Mr. WilliamiShcrvingron to Benjamin Franklin, Efq; of Philadelphia, con­cerning the Tranfit of Mercury over the .Sun, on the 6 of .May 17;3, as obferved in the ljland ~f Antigua: Communicated ~Y Mr. Peter Collinfon, F. R. S. p. 318.

XLIX. An Account ()f the Barometer, and the State of the Weather, at Dublin, from the 7 of MarclJ. 17;1, to the 28 of February 17;3, by James Si­mon, Efq; F. R. S. and Secreta~y of the Incor­porated Society at Dublin: Communicated by Mr. Henry Baka, F. R. S. p. 320.

L. Afecond Account of the new Meth('}d of opening the Cornea, for taking a·way the Cataratl:; k>' Mr. Samuel Sharp, Surgeon to Guy's tJ.ofpital, and F. R. S. p. 322.

LI. An attempt to explain an antient Roman in­fcription, cut upon a jlone lately found at llath. By John Ward, LL.'D. Rhet. Prof Grefa. anrJ V. P. R. S. P· 331.

LIL A Letter to the Right Hon. the Earl of Mac­clesfield, Prejident of the Royal Society, from Mr. Benjamin Wiifon, F. R. S. concerning fame cklhical Experiments, made at Paris. , p. 347.

LIII. Eleclrical Experiments, with an attempt to account for their flverai Pha?nomena; together with forne Objervations on Thunder-Clouds; ~r John Canton, M. A. and 1( R. S. p. 3 ;o.

LIV .

CONTENTS. LIV. Extraff of a Letter from Prof ejfor Bofe, of

Wirtembcrg, to the Right Hon. George Earl ~f Macclesfidd, Pr. R. S. with Obfervations there­upon, by Mr. \Vm. Watfon, F. R. S. p. 3 58.

LV . .An .Account of a Memoir, read at the Royal Academy of Sciences at Paris, by M. de Barros,

"Portuguefe Gentleman, concerning certain Phre­nomena obferved by him at Pans, in the /aft TranJit of Mercury over the Sun; by J. Short, .A. M. F. R. S. p. 361.

LVI. An Explication of an objcure Pajfage in Albert Girard's Co?fJmerJta~y on Simon Stevin's Works; ~y Mr. Simpfon, Profejfor of Mathema­tics at the Univerfi~y of Glatgow : Communi­cated by the Right Hon. Philip Earl Stanhope ..

p. 36ft L VII. Obfervations upon the Elelhicity of the Air>

made at the Chateau de Maintenon, during the Months of June, July, and Oll:ober, 17;3; being Part of a Letter from the Abbe Mazeas, F. R. S ..

to the Reverend Stephen Hales, 'D. V. F. R. S .. Tran_flated from the French by James Parfons,

M 'D. F.R.S. P· 377.

ERR AT .tt': 1'age 201, for Art. XXXII. nad XXXI. P. 34, Not, (1) fa,,

TAB. I. read TAB. II. In Sheet (Y) for 173, read 169, For 1.76~

rrad I 72. For I 77, read I 73. And far I So, reaJ I 76. Page 333, Note (z)for TAn. HI'. read Tu. II.

I. An

-- . -- ·- -

PHILOSOPHICAL TRANSACTIONS,

GIVING S01v1E

ACCOUNT 0 F THE

Prefent Undertakings, Studies, and Labours,

0 F THE

INGENIOUS, IN MANY

Confiderable Parts of the · W O R L D.

VOL. XLVIII. PART II. For the Year 1754.

L O N 'D O N~ Printed for C. DAv1s, Printer to the RoYAL Soc1ETY,

ovcr-againft Gray's-Inn Gate, in Holbourn.

M. DCC. LV,

PHJLOSOPHICAL

TRANSACTIONS.

The CONTE N TS. P AR T II. V O L. XL VIII.

I. VIII. A Treatife on the Prece.ffeon of the Equi­noxes, and in general on the Motion of the Nodes, and the Alteration of the Inclination of the Orbit of a Planet to the Ecliptic. lnfcribed'

. to the Gentlemen of the Royal Society, hJ M. De St. Jaques Silvabclle~ Tranjlated from the French M. S. by J. Bevis, MD. Page 38,.

LIX. A Letter to the Right Honourable George Earl of Macclesfield, P. R. S. concerning the Ages 0f Homer and Hefiod. By George Cofrard, M.A. P· 44J.

LX. An additional Remark to one of Mr. William Watfon, F. R. S. in his Account of the Abbe Nollet's Letter concerning Elec1ricity. BJ Tho .. Birch, 'JJ. 'D. Seer. R. S. p. 484.

LXI. ExtrafJ of a Letter of the Reverend Mr .. Jofeph Spence, Profejfor of Modern Hijjo~y in the Univerjity of Oxford, to Dr. Mead,[: R. Sr

P· 486. LXII . .A Letter to the Right Honourable George

Earl of Macclesfield, P. R. S. concerning the Va­lue of an Annuity far Life, and the ProbabilitJ "f Surviv<>rjhip. By Mr. James Dodfon.. p. 487.

[ 3 BJ LXIlI~

C ONT ENT S. LXIII. A Letter to Mr. Peter Collinfoni F. R. S.

concerning the Pheafant of Pcnfylvania, and the Otis Minor. By Mr. George Edwards. p. 499.

LXlV. A Letter to Mr. Peter Collinfon, F. R. S. concerning a Species of Cora/lines. By Mr. John Ellis, F. R. S. P· ;04.

LXV. Obfer·vations on the late fevere cold l/Tea­ther. By William Arderon, F. R. S. and Henry Miles, D. D. F. R. S. p. 507.

LXVI. .A Letter from Monjieur De l'Hlc, of the Royal Academy of Sciences at Paris, to the Re,verend James Bradley, V. V. Ajironomer Royal, and Sa, ilbn Profejfor of A/fro;:omJ at Oxford. Tranjlated from the French. p. ;12.

LXVII. Defcription of a Piece qf Mi:chanifm con­trived by James Ferguf-on, for exhibiting the Time, 'Duration, and f?2!,antitJ, of Solar Ecfipfes, in all Places of the Earth. p. 5 20.

LXVIII. A Letter from the Reverrnd Henry Miles, 'JJ. D. F. R. S. to Mr. John Canton, F. R. S. concerning the late hard Weather. p. ;z;.

LXIX. A Catalogue of the FIFTY PLANTS from Chelfca-Garden, prejented to the Royal Society by the worjhipfut Company of A porhecaries, for the Tear 17;3. purfuant to the 'JJirecfion of Sir Hans Sloane, Bart. Med. Reg. & Soc. Reg. nu­per Prtef; by John Wilmer, ir1. D. Clarijf. So­cietatis (f harmacettt. Lond. Soc. Hort. Chelf. Pr£f & Prteletf. Botan. p. ;z8.

LXX:. An Account of fame Experiments upon a Machine for meafitring the Way of a Ship at Sea. By Mr. J. Smearon, F. R. S. p. ;32..

LXXI. Ok(er·vationes Eclipjium Satellitum Jovis habitte Ulijjipone in Regali Collegio Beati./fi111tt

Virginis

CONTENTS. Virginir a necejfitati611s, dillte a Joanne Che­'Valitr, ·Prtts6rtero Seculari Congregationis Ora. torii; Anno 17;3. P· 546.

LXXII. Okfervatio Solis dejeflus Ulijfipone habita, in uf',de Beatijfimte Virginis a nec~!Jitatibus, nuncupatte a Joanne Chevalier, Prtesbytero Con­gregationis Oratorii, die 26° O[fobris I 7 ;3.

p. ;46. LXXIII. .An Ac-count of Jome ajlronomical Objer­

vations taken at Lisbon ~J M. John Chevalier, in the Tear 17 53. By James Short, M. A. and f~ R. S. P· 548.

LXXIV. An Explanation of a new Inflrument for meaji,ring /malt Angles, the fir.ft Account of 1r:h1ch was read before the Royal Society May 1 o, 17;3. By Mr. John Dollond. In a Letter to James Shorr, M.A. and F. R. S. p. ;51.

LXXV. An Account of an Earthquake felt at York on the 19th of April 17;4. In a Letter

. from Mr. David Erskine Baker to Tho, Birch, 'D. D. Secret. R. S. p. ;64.

LXXVI. .An Im:efligation qf.fome Theorems which jugf!..efi fame remarkable Properties of the Circle, m,d are of Uje in refolvin,_!!_ Frallions, whofe 1Je'Jf,ominators are certain Mttftinomials, intO' more _fl'.mple ones. By Mr. John Landen. p. 566.

LXXVH. An Account of an extraordinary 1Jifea_fe of the Skin, and its Cttre. Extra[ied from the Italian of Carlo Crufio; accompanied with a Let­ter of the Ab!Je Nollet, F. R. S. to Mr. William Watfon, F. R. S. by Robert Watfofl, M. ']). F. R. S. p. 579.

[ 3 B] z LXXVUL

C Q NT ENT S. LXXVIII. Experiments concerning the Ufa of tht

Ag4ric of Oak in flopping of Htemorrhages. p. 5'88.

LX~IX. Defcription of a new Pyromete,, with a Table of E:tperiments made therewith. By Mr. J. Smeaton, Jt~ R. S. p. 598.

LXXX. A Remark concerning the Se~"< of Holly. By Mr. John Martyn, F. R. S. Profejjor of Bo­tany in the Univerfity of Cambridge. p. 613.

LXXXI. A Continuation of the · Account of the Weather in Madeira. By 'Dr. Tl1omas Heberdcn, F. R. S. p. 617.

LXXXll. Obfervations upen Fath~r Kircher's Opi. nion concerning the burning of the Fleet of Mar­cellus 6y Archimedes. Bj James Parfons, M. V. F. R. S. · p. 621.

LXXXIII. An Account of Jeveral Bones of an Ele­phant found at Leyfdown in the lj!and of Shep­pey. In Two Letters from Mr. Jacob, Surgeon at Fevedham, to James Parfons, M. 'D. F. R. S. dat~d .May 24, 17;4. p. 626.

LXXXI V. A Lett fr from Mr. John Ellis, F. R. S. to Mr. Peter Collinfon, }? .. R. S. concerning t~e animal Life of th_ofe Coral!inesi that look like minute Trees, and grow itpon ()_yflers and Fucuis all round the Sea-coajf of this Kingdom. p. 627.

LXXXV. Extract of a Letter frqm Camillo Pa­derni, Keeper of the Mufeum Herculaneum, to Tho. Holles, Ejq; dated at Naples, April 27, 17;4. · P· 634.

L)C,XXVI. Experimental Examination of a white metallic Subjlance, faid lo be found in the Gold Mines of the Spanifh W cft-Indics, and there

known

CONTENTS. known by the .Appellation of Platina, P1atina di Pinto, Juan Blanca. By William Lewis, M. B. F. R. S. p. 638.

LXXXVII. An Explication of all the Infcriptions in the Palmyrene Language and Charafier hi­therto publijhed. In j:ve Letters from the 'Re­verend .Mr. John Swinton, M. A. of Chrift­Church, Oxford, F. R. S. to the Reverend Tho­mas Birch, D. D. Secret. R. S. p. 690.

LXXXVlII. Extra[! of a Letter from John Lining, M V. of Charles Town, in South Carolina, to Charles Pinckney, E/q; in London: Wtth his Anfwer! to fe·vera! Q._ueries_fent to him concern­ing his Experiment of Eletlricity with a J(ite.

, p. 7;7. LXXXIX . .An A11,jwer to Vr. Lining's f?2.!t,ery re­

lating to the Death of Profeffer Richman. 13_1 Mr. \Villiam Watfon, F. R. S. p. 76;.

XC. E:ittraa ~J a Letter from John Henry Wink­ler, Profejfor ~f Natural Philo[ophy at Leipfic, and Fellow of the Royal Society, to Thomas Birch, 'D. 'D. Secretary of the Rora! Society, relating to 'I wo 'elefirical Experiments; tranf lated from the Latin. p. 77 2.

XCI. An Accottnt of a Fire-Ball, Jeen at Hornfcy, b1 William Hirft, F. R. S. communicated in a Letter to Samuel Mead, Efq; F. R. S. p. 773.

XCII. A Letter from i}fonjieur Clairaut, Member of the Royal Academy of Sciences at Pa.ris, and F. R. S. to Thomas Birch, V . V. Secret. R. S. containing a.Comparijon between the Notions of M. deCourtivron and Mr. Mclvil, concerning the "D!ffirence of Refrangibility of the Rays of Light. p. 776.

XCIII.

CONTENTS. XCIII. A Letter to the Right Honourable the Earl

of Macclesfield, Prejident of the Royal Socie~y, concerning Jome ne7.PJ ele!Jrtcat Experiments, kr John Canton, M.A. and F. R. S. p. 780.

XCIV. Part of a Letter from Cheney Hart, M. 'D. to William Warfon, F. R. S. gi·ving Jome Ac­count of the Ejfefls of E!eflricity ir, the Coun~y HoJPital at Shrewsbury. p. 786.

XCV. A Letter from the Reverend \Villi:1111 Brakcnridge, 'D. 'D. and F~ R. S. to George Lew is Scot, E_{q; F. R. S. concerning the .1,.-Vumber of Inhabitants within tht London Bills of Morta· li~y. p. 788.

X CVI. A Letter from Mr. Willi;im Watfon, . F. R. S. to Char ks Gray, of Cokhdl:er, E/q;

F. R. S. in relation to a large Calculus found in a Mare. p. 800.

XCVlI • .A. 'Dijfertatirm on -the Bdemnircs, ht a Letter to Smart Lcrhieullicr, Efquire, F. R. S. by Mr. Gufiavus Brander, F. R. S. p. 803.

XCVIII. Some O/Jjervations upon the Agaric, lately applied after Amputations, with regard to the determining its Species. By Mr. William Wat-

. fon, F. R. S. . p. 811. XCIX. Two Letttrs concerning the Ufe of .Agaric,

tis a Styptic. 1 ,One from LVlr. Jofeph Warner, F. R. S. and Surgeon to Guy's Hofpital, to Tho. Birch, 'D. 'D. Seer. R. S. the other to Mr. Jo­feph Warner. p. 8'13 ..

C. Extraft o'f a Letter from Monf. Bonnet, F. R. S. of Geneva, to John Clephane, M. 'D. F. R. S. tranjlated from the French. p. 818.

CI. ExtraEt of a Letter from Confiantinople, of the 16th of Septembtr 17 54, from Murdock

Macke1izie)

CONTENTS. Mackenzie, M. 'D. concerning the late Earth­quake there. . p. 8 r 9.

CII. Extratl of a Letter from Camillo Padcrni, Keeper of the Herculaneum Mujeum, to Thomas Hollis, Ejq; relating to the late 'Difcoveries at Herculaneum. p. 8 2 I.

CHI. ExtraEt of a Letter from Sir James Gray, Bart. his 1vfa}efiy's Envo,y to the King of Naples, to the Right Honourable Sir Thomas Robinfon, Knight ~f the Bath, one of his M~je/ly's Se­cretaries of State, relating to the Jame Dijco­i,·eries at Herculaneum. p. 8 2 ;-.

CIV. An Accottnt of Jome Trials tu keep lf/ater and Fijh .fweet, with Lime-water. By Stephen Hales, 'D. ']). F. R. S. p. 826.

CV. Medical and Chemical Obfirvations upon An­timony. By John Huxham, M. 'D. F. R. S.

p. 8 3 l. CVI. An Account of Mr. Samuel Tull's Method of

cajlrating Fifa. Communicated bJ W. Watfon, F. R. S. p. 870.

CV II. dn Attempt M point out, in a concife man­ner, the Advantages which wilt accrue from a periodic Reri·iew of the Variation of the magne­tic Needle, throughout the known World; ad­drejfed to this Royal Society ~y William Moun­taine and James Dodfon, Fellows of the faid Society, and requefling their Contribution there­to, 6y communicating fuch Ob(ervations concern­ing it, as they have lately made, or can procttre from their Correfpondents in foreign Parts. p. 87;.

LVIII. A