$6 Ohfervat'iojts on the J'tjuco Ju Cunco, 



it is farely very efleiitial to have a clear idea of the power an4 

 Itrength of an acid ufed in various mctalHc fokuions. 



This comparifon was made in September laft, and the 

 temperature about 60. Having a flock of acid of the fpecific 

 gravity 1435, a Httle diftilled water was daily added, and 

 the gravity taken the day after each addition of the water ; 

 then the anoinctre de Baunu was innncrfed with the follow- 

 ing corrcfpondence. It will be eaiy to underftand and cal- 

 culate the degrees of Baume both above and below thofe al- 

 ready compared and examined. I had no acid of higher 

 gravity than 1435, nor did I dcfccnd lower than 1150; which 

 IS a weaker acid than nfed in moft metallurgic operations. 

 The areometer, or fcfe-liqueur, is graduated from o up to 50, 



VII. Obfi-rvations on the Plant by which the Indians of Ame- 

 rica preferve themfelvcs from the Bite of venomous Sirperiis. 

 Communicated to Coa/zf KuMFORD (^' £)&« Pkdko d'Ok- 



BIES Y VaKvJAS *. 



■ X HE abundance of venomous ferpents found in tli« 

 warm diflrids pf America has rendered it necellluy for the 



•'■ From the Bibllotheque Britanniqve, by Proieffor V\f^<^^- 



unfovlun..; 



