50 POISONS : THEIR EFFECTS AND DETECTION. [§ 36 . 
thought desirable, submitted to various “ cultivation ” experiments. 
The greater portion is at once examined for volatile matters, and having 
been placed in a strong flask, and, if neutral or alkaline, feebly acidulated 
with tartaric acid, connected with a second or receiving flask by glass 
tubing and caoutchouc corks. The caoutchouc cork of the receiving 
flask has a double perforation, so as to be able, by a second bit of angle 
tubing, to be connected with the mercury-pump described in the author’s 
