4o On the identity of the Pyromilcous t 



but he fails in accounting for the inequality of the northenrf 

 and fqulhern, fcr he fuppofes the courfe of the waters to 

 tend equally from both poles towards the equator ; which 

 would render the depositions equal on both fides j which is 

 contrary to obfervation. 



VI. On the Identity of the Pyromucous, Pyrotartarcous, and 

 Pyroligneous Acids ; and the Neceffity of not conjidering 

 them any longer as dijlincl Acids. By C. Fourcro'T 

 and VAUQ.UELIN *. 



I. On the Multiplicity of the Vegetable Acids. 



[I EN Bergman and Scheele had discovered fe vera! 

 vegetable and animal acids before unknown, and had de- 

 ft roved the pretended identity admitted in regard to thofe 

 bodies, all the chemifts employed themfelves with great zeal 

 in fubje&tng various vegetable acid fubftances to a new exa- 

 mination. The number of compounds, which till then had 

 been reduced to two kinds, increafed fo much, that it was 

 fuppofed it would far exceed that of the acids which had been 

 difcovered among the foffils, and that it would be impoflible 

 to fet bounds to the multiplicity of thefe natural productions 

 <)f organifed bodies. 



The four liquors, extracted by diftillation from mucous 

 bodies, wood, and tartar, though owing to an artificial de- 

 compofition, have been comprehended in the clafs of the 

 tcjretable acids, well characterifed as poffeffing a peculiar 

 natures fome analogies founded on their origin, their browri 

 colour, and their burnt odour, have caufed them to be re- 

 ferred to a fpecial genus, under the name of the empyreu- 

 matic acids. If we collect the facls which feem to prove' 

 that they are different in nature not only from the other 

 acids, but from each other, they will eafily fhow that thefe 

 acids have not been furnciently examined to be well known; 

 that chemifts had only very imperfect ideas refpe&ing their 

 nature; and 'hat it was for want of accurate analyfis that 



" F.roffl the Annates de Cbimic, No. 104. 



the^ 



