c 98 : 



two bodies have as yet been discovered in no other 

 cases. The phosphoric acid is found free in the 

 onion ; and the phosphoric, sulphuric, muriatic, and 

 nitric acids, exist in many saline compounds in the 

 vegetable kingdom ; but they cannot with propriety 

 be considered as vegetable products. Other acids 

 are produced during the combustion of vegetable 

 compounds, or by the action of nitric acid upon 

 them ; they are the camphoric acid, the mucous or 

 saclactic acid, and the suberic acid ; the first of which 

 is procured from camphor ; the second from gum or 

 mucilage ; and the third from cork, by the action of 

 nitric acid. 



From the experiments that have been made upon 

 the vegetable acids, it appears that all of them, except 

 the prussic acid, are constituted by different propor- 

 tions of carbon, hydrogene, and oxygene ; the prus- 

 sic acid consists of carbon, azote and hydrogene, with 

 a little oxygene. The gallic acid contains more car- 

 bon than any of the other vegetable acids. 



The following estimates of the composition of 

 some of the vegetable acids have been made by Gay 

 Lussac and Thenard. 

 100 parts of oxalic acid contain : 



Carbon 26,566 



Hydrogene - - 2,745 



Oxygene - 70,689 



Ditto of tartaric acid : 



Carbon 24,050 



Hydrogene - - - 6,629 



Oxygene - - - 69^2! 



