382 CHEMICAL PROCESSES. CHAP. It. 



and Kessel-Meyer, who were afterwards followed 

 by Rouelle and Bucquet, the former of whom in 

 his dissertations, and the latter in his introduction 

 to the study of the substances extracted from vege- 

 tables, gave a precision to the process of analysis 

 and a distribution to the facts ascertained, that 

 tended most materially to the elucidation of the 

 And ap- subject. Finally, from the application of pneumatic 



plication . 



ofpneu- chemistry as introduced by Priestley, extended by 

 the profound investigations and important dis- 

 coveries of Lavoisier, and further advanced by the 

 researches of Ingenhoutz and Senebier; together 

 with the experiments of Vauquelin, Proust, Pelle- 

 tier, Chaptal, Deyeux, Saussure, as also of Thomson 

 and Davy, and lastly of Gay Lussac and Thenard ; 

 the vegetable analysis has attained to a degree 

 of perfection surpassing all previous calculation, 

 and beyond which it cannot perhaps be carried 

 very far. 



