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ENGRAVINGS. 

 Vol. XLI. Pepys's Mercurial Voltaic Conductor. — Leslie's Di^ 

 ferential Thermometer. Diagrams to illustrate Dr. Woluastos's Peri, 

 scopic Camera Obscura and E'licroscope. — Count Rumford's improved 

 CofFee-pots. — •"Mr. Goss's Instrument to work Addition of Numbers 

 •with Accuracy and Dispatch.' — Mr. Davjs's hanging Scaffold; and 

 Mr. Martin's Method of relieving a Horse from a Cart when fallen 

 down in its Shafts. — A Quarto Plate to illustrate Mr. J. Hicks's Ac- 

 count of the Situation and Means of raising the Royal George.^ — A P|ate 

 to illus'.rate Mr, Southern's Essay on the Equilibrium of a Gombinution 

 of Beams, Blocks, Sec, and on the Polygon of Forces. — A Plate to illustrate 

 Mr. Steevens's Account of a Meteor seen at London and other Places in 

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



Vol. XLU. A Plate contaiTiing Professor Leslie's Atmometer, and 

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

 qf 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 

 Inland of Java, and Figtires to illustrate Mr. Walker's Paper on the Elec- 

 tric Fluid. — A Plate to illustrate M. Link's ^lemoir on the Anatomy of 

 tylants, and Dr. Wollaston's Cryophorus.— A third Plate to illustrate 

 •^M. Link's Memoir on the Anatomy of Plants. — Mr. T.Jones's Seclo-. 

 graph, — a new Instrument for dividing right Lines into equal Parts, measur- 

 ing Angles, and inscribing Polygons in the Circle, j5cc. 



Vol, XLIII. A Plate to illustrate a New Transit Instrument invented 

 hy Sir H. C. Englefield, Bart. — A Plate to illustrate the Use'of ALr- 

 vJTtessels in Plants. By Mrs. Ibbetson. — A Plate to illitstrate M. Se- 

 mentini's new Apparatus for producing Oxygen Gas to restore sus- 

 pended Animation — Mr. Reade's Paper on the Refraction of the Solar 

 Rays — and Mr. Hargreaves's Observations on Colours.— A Plate to 

 illustrate Mr. J. Whitforu's mechanical Substitute for Leeches; and Mr. 

 J. Tilley's Hydro-pneumatic Blow-pipe. — A Plate to describe Mr. 

 jK- PIuGHEs's Gudgeon for the Shaft of a Water-wheel; and Mr. Pad- 

 bury's Guard far a Can iage-wheeh — A Plate to describe Captain Peat's 

 Temporary Ship's Rudder. — A Quarto Plate of Mr, Samuel Jones'^ 

 Sofa Bed. 



Vol. XLIV. A Plate to illustrate Mr. Hume's Gazometcr and Blow- 

 ' pipe ; a Proposal for an Improvement of the Galvanic Trough ; and a 

 new Apparatus for preparing pure Muriatic Acid. — A practicat Diagram 

 for obtaining the Lunar Distances observed by a Sextant. — Electrical 

 Apparatus to illustrate Mr. Brani»e*s Paper on some new Electrical 

 Phenomena.— A Quarto Plate to illustrate Mrs. Ibbetson's Paper on the 

 Cuticle of Leaves. — Brunton's Patent Chain Cable. — Figures relative to 

 Dr. Brewster's Paper on the Affections of Light transmitted' through 

 crystallized Bodies.— A Plate to illustrate Dr. Brewster's Paper given 

 in our last Number, 



Vol. XLV. A Plate to illustrate the Nourishment produced to the 

 Plant by its Leaves. By Mrs. Tbbetson. — A Plate to illustrate Mr. 

 Bakewell's Sketch of the Arrangement of the Rocks and Strata in the 

 Northern Counties of England. — Plates to illustrate Mr. Robertson 

 Buchanan's Description of the Steam-Boats on the Clyde; and Mrs. 

 Ibbetson's Paper proving that the Embryos of the Seeds are formed in 

 the' Root alone — A Plate to illustrate Mr. John Walters'* Improve- 

 ments in Naval Architecture. — A Quarto Plate on the Roots of Plants.' — 

 An Octavo Plate of Mr. Singer's Electric Columns; Mr. Walker's 

 Electrometer; P\.ochon's Apparatus for ascertaining U'le Heat of coloured 

 Rays. 



