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TRANSACTIONS of the GEOLOGICAL SOCIETY, illustrated 

 by n Volume containing nynierolis Plates p^dcI Ivlaps, most of them 

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Of wliom may also be had, 



THE FIRST AND SECOND VOLUMES, 

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This Day*is published. 

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THE FlPvST PART of the FOURTH VOLUME of the GEOLO. 

 • ' GICAL TRANSACTIONS. ' . 



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ENGRAVINGS. 



. Vol. XLT. Pepys's Mevcuriai Voltaic Conductsr.— Leslie's Dif- 

 ferent'.il Thermometer. — Diagrams to illustrate Dr. Wollaston's I'eri- 

 scooic CameV.-! Obscura ar.d'Mlcroscope. — Count Ruwfoh.d's improved 

 CotFee-pcts. — Mr. Guss's Instrument to work _ Addition of Numbers 

 vidi Accuracy and Dispatch^— Mr. Davis's hanging Scaffold; and 

 Ml-. Martin's Method of relieving - a Korse fiom a Cart whoa fallen 

 dovn in its Shafcs.. — A Quarto Plate to illustrate Mr. J. Hicics's Ac- 

 count of tlie Situation and Means of raising the Royal George. — A Plate 

 to illus.iat-^ Mr. Southern's Essay on the Equilibrium of a Combination 

 of B^ams, Blocks, &c. and on the Polygon of Forces. — A Plate td illustr;ite 

 Mr. &TH EVENs's AccoLTiiit of a Meteor seen at London and other Places in 

 March last. — A Plate to illustrate Mr Mach ell's Annular Saw. 



Vol. XLII. A Plate containing Professor Lf.slie's Atmometer, and 

 Figvues to illustrate Dr. Wollaston's Paper on the elementary Particles 

 of certain Crystals. — A Sketch of that Part of the Island of Java which 

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

 Island of isva, and Figures to illustrate Mr. Walker's Paper on the El»c- 

 tric Fiuifi. — A P! uc to illustrate M. Link's Memoir on the Anatomy of 

 Plants, and Dr. V.'OLf.ASTON's Cryophorus. — A third Plate to illustrate 

 M. Lin'k's '^temoir c.i t'.ie Anatomy of Plants. — Mr. T.Jones's Secto- 

 gphs,, — anew Instrument for dividing right Lines into equal Farts, measuf- 

 ^dln Angle and inacribing Polygons in the Circle, &c. 



