TO CORRESPONDENTS. 



Sir George Cay ley's Communication hii:beeii received, and 



will appear in our next. , - , ^, , , 



Tlie hiture Couimunicattons .of I. M. are earnesdy requested, 



and will receive every attention. .u c u- . r »v,o 



Any further Commuutcaticns -for Z. &n the bubject ot the. 

 Medical Prize of Fifty Pounds will be unnecessary, as the Gen ' 

 tleman who offered it is now no more. 



« • CoiHTnunications for this Work, addressed to the Ed'itor, 



ENGRAVINGS. 



Vol XL. A Plate to Illustrate the Fonridatlon of Mr.WiiLiAM Job 

 teajporaiTCcrn Rick.— Mr. Stephens's Method of dividing Brick 

 Section of Mr. William Jones's temporary Con, Rick,— Mr. Waiste 

 Tmprovement on the Acorn Dibble— A Plate to illustrate Mr. Tawn 

 New Thrashing Machine.— Two Octavo Plates < escriptive of a N\ w 

 Aire for Pumping Water. — Two Plates debcriptik; of the Muscular, 

 tion of Snakes— Figures to illustrate such Potion^ of a Sphere as fc 

 ihLir Attraction expressed by an algeb.aic Quantity—VAX Helm« 

 DiffercnlialThermo-.neter.— FormatlonofOvalsfjrUrdeners.— CKAViS! 



T/S-.t^tiP Trinsit A Plate to ' iliustrnte Mr. jrohe's ExperiinejtS 



the Iii'iueiice of tiie Brain on the Generation )t Aiimal Heat. 



v^i XfJ.- Pepvs's ?/Icrcuri.;l Voltaic Cmducor. — Lislie's I 

 uTivi.^-...i iVic> ;..... ^.jf„j.__j3jj,gi-ai-riE to iliustnte Dr.Wor.LAiTos's P 

 scopic Camera Cbscura and Slicroscope. — Count R\mFor>'s impro^ 

 Coffee-pots.— Mr. Gosa'e Instrument' to work Adiition of Numb 

 widi Accuracy and Dispatch.— Mr. Davis's hangii^ Staftoid; 

 ^ Mr. Martin's Method of relievlnsr a Horse from a fart when fal 

 dov.Ti in its Shafts. — A Quarto Plate to illuttiate Mi J. Hicks's j 

 cotjnt of the Situation and Means of raiuiAg the Rjyal Gorpe!— A P. 

 tDiI]ustr>.te Mr. South r.Ru's Essay on tlte Equilibrium c a'CpinbiniU 

 of Beams, Blocks, &c. and on the Polygon of Forccs~A Pate to illustj 

 Mr. STEEVENs'y Account of a Meteor seen at Lohton andothe; Place 

 March la^t.— -A Plate to illustr.ite Mr Machell's Vnnula- Saw. 



Vol. XLli. A Plate containing Professor Leslk'a At-nometer, 

 Figures to illustrate Dr. WoLLAsrojf's Paper on thtelenientary Part, 

 of certain Crystals. — .\ Sketch of that Part of the l!ai:d of Java wl 

 contains the natural Lake of Sulphuric Acid. — Interior of Volcano in 

 Island of Java, and Figures to illustrate Mr. AVALKEa'sPaper on th: E 

 trie Fluid.— A Plite to illustrate M. Link's Memoir ei the. nnatom 

 Plants, and Dr. V/ollaston's Cryophorus. — <i\ tliitd ilate to illust 

 M.LiNii's Memoir on the Anatomy of Plant'^.-— (Vlr. T. Jonbs's S« 

 graph,— a niAvr.istriimenl for dividing ri^ht Lines inloeq\»! Part?,mea 

 ing Angles. ?nd iD'xribirig Pclygong in the Circle, &e. 



Vol. XLIIL A Plate to illustrate a New I'ranqt Insimment inv* 

 by SirH. C. Esglefi£:ld, Bart.— A Plite to ilhutrat.:- the Use of i 

 Vessels in Plants. By Mrs. Ibj:etson.—A Plate to iUustratxj M. 

 MEMTiNi's new Apparatus for producing OxyKcn Ga-i to ./estore 

 pcnded Animation — Mr. Reade's Paper on the Refraction of the S 

 Rays— and Mr. Hargrkav^s's Observations on Colours. — APlat 

 illustrate Mr. J. Whitford's mechanical Siibstitute for Leeches; and 

 •f. Tilley's Hydro-pneumatic P)low-pipe. — A Plaie to descr-'be 

 R. Hughes's Gudgeon for the Shaft of a Water-wheel; and Mr. i 

 bury's Guard for a Carriage-wheel.— A Plate to describe Captain Pe. 

 T^^j^IT^ Ship's Rudder.— A Quarto Plate of Mr. Samoel Jon 



