95 



in the course of his examination of the lactic acid, 

 which had determined him to declare this acid 

 to be acetic. 



The matter of transpiration is always acid, 

 and reddens litmus paper very distinctly. I col- 

 lected some drops of sweat on a watch glass, and 

 suffered them to dry, when they presented crys- 

 tals of muriate of soda, and also visible marks of 

 the usual acid extract of the secretions ; on the 

 addition of water, they left an insoluble residuum, 

 which, when strongly heated, smelt like burnt 

 albumen. In the mean time, much remains to 

 be known on the subject of transpiration, before 

 we can discover the various matters secreted by it 

 from the body, and the different modifications to 

 which it is subject, according to different cir- 

 cumstances. 



The Nails, which are a continuation of the 

 skin, are of exactly the same composition as the 

 epidermis; but have a firmer texture. And of this 

 nature are also hoofs, talons, claws, and such 

 other parts, as in the brute creation answer the 

 purpose of nails. 



The Hair is of a peculiar composition. 

 , and Ac HARD have made several experi- 



