Fossils. 161 



formation of the reader we will enumerate 

 those belonging to each of the above 

 classes. 



The miner a I acids at present known are 

 the sulphuric (formerly called the vitriolic 

 acid); the nitric acid, called also aquafor- 

 tis; the muriatic or marine acid, called by 

 artizans the spirit of salt ; the carbonic 

 acid, formerly called the acid of charcoal, 

 aerial acid, or fixed air, &c. the phospho- 

 ric acid, which is likewise an animal acid, 

 it being found amongst animal matters as 

 well as among minerals ; the acid of bo- 

 rax ; the flouric acid, formerly called the 

 acid of spar /the arsenic acid ; the moiyb- 

 die acid ; the tungstenic acid ; and the 

 chromic acid. The last four are also 

 called metallic acids. 



The vegetable acids are the acetic, or 

 vinegar, the acid of tartar, the empyreu- 

 matic acid of tartar, the oxalic or acid of 

 sorrel, the acid of galls, the citric or lem- 

 on acid, the malic or acid of apples, the 

 benzoic, or the acid of benjamin, the em- 

 pyreumatic acid of sugar, the acid of cam- 

 phor, and the suberic or acid of cork. 



The animal acids are, the acid of milk, 

 the acid of sugar of mu% the formic or a- 

 O 



