vni CONTENTS. 



SUPPLEMENT to VOL. XXVIH. 



Engravings of the following Subjects: 1. Dissections of Plants to illustrate the 

 Growth of the Bud, by Mrs. Agnes Ibbetson. 2. A Macliine for evaporat- 

 ing Liquids without He^t, by the late Mr. Joseph Moiitgollier. 



'■MX- 

 h On the Gaseous Combinations of Hidrogen and Carbon. By Thomas 

 Thomson, M. D. F. R. S. E. - - - 321 



II. On a new Compound resulting from the Union of Benzoic Acid with Cam- 

 phor, in a Letter from F. R. Go war, Esq. - - 33S 



III. Comparative Analysis of Gum-Resins: by Mr. Henry Braconnot, Pro- 

 fessor of Natural History, &c. - - - - 344> 



IV. On the Mechanism of Respiration in Fishes: By Mr. C. Dumeril, Pro- 

 fessor at the Medical School, &c. . - - - 350 



V. Farther Experiments on the alkaline Strength of the Product of the Oxigena- 

 tlon of Potassium, with Observations on the Nature of the alkaline Metalloids : 

 By J. Murray, Lecturer on Chemistry, Edinburgh. - 359 



VI. On the Affinity of Muriatic Acid for different Bodies, considered with Re- 

 gard to Mr. Davy's Ideas of its Nature. In a Letter from a Corres- 

 pondent. - - - - - SO** 



VIF. Description of an economical Process for Evaporation, invented by the 

 late Mr. Joseph Montgolfier : by Messrs. Desormes and Clement - 37S 



Scientific News. -•-,••• $19 



