134 Chemical PhilosopJii/. [ChaP. IL 



with different materials. These attempts were 

 made, and various phms successively proposed, by 

 Cavendish, Fontana, Volta, Schcele, de Marti, 

 Guyton, Achard, Berthollet, Davy, and several 

 others. But the instrument, in its most favourable 

 form, is still liable to much uncertainty and inaCf 

 curacy in its application. 



The machine for impregnating water with c^r- 

 bonic acid gas, or ^/ixed air, invented a few 

 years ago by Dr. Nooth, deserves to be respect- 

 fully mentioned,, as a monument of ingenuity, 

 and as a very useful piece of fiirniture for every 

 chemist and physician. Beside this, our list 

 might be enlarged by the enumeration of many 

 other instruments and machines which have 

 been added to the chemical apparatus in modern 

 times, and which have greatly contributed to the 

 ease, elegance, and perfection, of chemical experi- 

 ments. 



After mentioning the great names, and the bril- 

 liant discoveries, which have been recounted in 

 the foregoing pages, it Avould be unjust to omit 

 taking notice of some other philosophers who have 

 distinguished themselves by their publications or 

 experiments in this branch of science. Among a 

 great number, whose names and labours will be 

 found honourably recorded in the scientific history 

 of the age, we may mention bishop Watson, Mr. 

 Nicholson, Dr. St. John, Mr. Henry, Mr. Cruik- 

 shank. Dr. Darwin, lord Dundonald, Mr. lyambe, 

 Air. Higgins, and Dr. Thomson, of Great Britain; 

 Messrs. Chaptal, Monge, Monnet, Beaume, Cadet, 

 Thouvenel, la Metherie, Adet, and Seguin, of 

 France; and van Ilomberg, Junckcr, Schroeder, 



