1910. | with the State of Aggregation of Matter. 109 
A fine-bore capillary tube with opal-glass back graduated in the upper 
part from 50 to 200 mm., the lower mark of which is 50 mm. above an 
etched zero mark, is inserted through a rubber cork with the lower end 
downwards into a tube of 24 mm. diameter and 20 c.c. capacity, provided 
with a side-tube at the upper part near the cork, which is connected with 
an indiarubber ball, and drawn out at the lower-end with a fine, almost 
capillary, tube, provided with a stop-cock B. Through the rubber cork is 
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inserted a small funnel provided with a stop-cock A. The vessel into 
which the capillary tube is inserted has an etched mark on the outside; and, 
by means of a cathetometer, the capillary tube is so adjusted in the cork that 
its zero point is exactly opposite this etched mark. The liquid under 
examination is introduced through A, and by pressure of the rubber ball, 
and closure of the tap A, is caused to rise in the capillary. Stopcock A is 
then opened. Liquid is let out from the apparatus by stopcock B, or in by 
stopcock A, until the lower level is exactly at the zero point, which can be 
VOL. LXXXIII.—B. K 
