ENGRAVINGS. 



Vol. XXII. is Illustrated with a Quarto Plate containing magnified Re r 

 presentations of the Parasitic Plant which causes the Blight in Corn : 

 engraved, by P of the Right Hon. Sir Joseph Banks, P. U.S. 



from the original Drawings. — A Plate containing Mathematical Figures to 

 illustrate the best Form to he given to a Plough-ear; to illustrate a Paper 

 by President Jefferson — A Portrait of Dr. Pries iley, from a Model 

 taken from the Life. Engraved by E. Mackenzie — A nondescript Aquatic 

 Insect, and microscopic Views of the Parts — Also Figures to illustrate a 

 Paper on Elasticity — A Plate respecting the Physiology of Vegetables — 

 Mr. Sepp: hod of vSuspending Ships — Figures to illustrate Messrs. 



Humbuli! ry of Terrestrial Magnetism — Trie Hydromis 



Coypou — The Yellow- b ' — The White bellied Hydromis. 



Vol. XXLii. is illustrated with a Plate representing a Variety of the 

 Genus Acarus — Mr. Davy's Apparatus for the Analysis of Soils — An Ap- 

 paratus for the Use of Aquatinta Engravers, to prevent them from being 

 annoyed with the Acid Fumes liberated in the Process — A Skeleton of the 

 tian Ibis — The Planet Saturn, according to the Form ascertained by 

 Dr. Herschel — A Portrait of. James Watt, Esq. F. R.S.; engraved by 

 Mackenzie from an original Fainting — Machine to enable Shoemakers tq 

 perform th<-.ir Work in a sian 1 ire — A Plate illustrating Dr. Her? 



SCHEl's Paper on the Motions of the Heavens — Mr. Charles's Machine 

 lor laying Land level — Apparatus for making Gaseous Oxide of Carbon. 



Vol. XXIV. is embellished with a Plate of Figures to illustrate Mr. Dal- 

 ton's Theory of the Absorption of Gases by Liquids — On the same ; — also 

 a Refrigeratory for Distillation, acting on the Principle of the Syphon — The 

 EtTects produced by Mr. Ez. Walker's newly invented Cometarium — 

 A Quarto Plate illustrative of Experiments by Sir James Ha el, Bart., on 

 the Effects cf Compression in modifying the Action of Pleat — Mr. Stee- 

 vens's improved Gasometer, for Purposes where uniform Pressure is essen- 

 tial — A Plate illustrating Mr. Walker's Paper on the apparent Magnitude 

 of the horizontal Moon — A Quarto Plate illustrative of Sir James Hall's 

 rimtflts on the Effects of Heat modified by Compression — A Portrait 

 of Mr. Aueert: engraved by tVlr. E. Mackenzie- — A Quarto Plate of Na- 

 tural History, viz. the Fishes EremqphiJus Mutisii, Astrobhpus Grixalvn, and 

 Pimelodus Gyehpumi and a South American Monkey, the Simia leonina : 

 engraved by Lowry. 



Vol. XXV. contains an Octavo Plate illustrative of Experiments by S.ir 

 James FI all on the Effects of Compression in modifying the Action of 

 Heat — A Quarto Plate on the same Subject — A Quarto Plate to illustrate 

 Sir James Hall's Paper on the Effects of Heat modified by Compression 

 — .\']r. Salmon's improved Geometrical Quadrant, Level, and Calculator, 

 for ascertaining inaccessible Distances on Land or at Sea. — M. Montgol- 

 fier's new Calorimeter, for determining the comparative Quantities of 

 Ca'oiic evolved by the Combustion of different Kinds of Fuel — Mr. Gil- 

 bert Gilpin's improved Crane with Flexible Chains — Mr. 'Herbert's 

 Book-case Bolt, and Mr. Le Caan's Check for Carriage Wheels on Rail- 

 Roads — Salmon's Improvement on Canal Locks Figures to illustrate 



M. Giiotthiuss Memoir on the Decomposition of Water by Galvanism 

 — A Bust in Silex, found coated over with Chalcedony. 



Vol. XXVI. is illustrated with a Quarto Plate of M. Le Roy's Chrono- 

 meter — Mr. Syi.v b. her : s improved Air-Pump — A large Plate relating to 

 Le Roy's Chronometer — An Octavo Plate on the same Subject — The Irish 

 Canal Track-Boat — Mr. SteevenVs Autocratic Cock for large Reservoirs- 

 Mr. V improved Pioton for Steam-Engines — -Another Plate relating 

 to the same Snbj.jt. 



