£ 35 3 



mould be evaporated, and the refidmim may be 

 placed on a hot bar of iron, ami if there be any 

 arfenic, it is known by emitting a ftrong garlick- 

 like fmell or this refiduum may be moiftened 

 with oil, and put between two bright plates of 

 copper, which, when heated, are turned of a 

 white color, if any arfenic be prefent j but the 

 fmell generally affords a fufficient teft. 



SEC T. 



