Researches respecting the radical of Benzove Acid. 265 
filled with chloride of calcium. , Fig. Q.isa glass tube about thir- 
ty inches in length fastened above to the pump by a short and broad 
piece of atube, and dipping below in mercury. It has no other 
LLY: 
[LLLILLLLLLLLLLLLLLLLLELLLLL 
WHALE 
LLL LLL 
object than to prove by the rise of the mercury that all the con- 
nections of cork and caoutchouc are tightly closed, and it is removed as 
soon as the pump is put in operation. Indeed it may be dispensed 
