on the Absorption of Carbonic Acid Gras by Liquids. 101 
ervoir, when conveyed into the flask. The end of this tube is 
mounted with a close cork and smaller glass tube, to be placed 
in the near opening of the flask when the gas is to be passed into 
the latter and the measuring tube. 
onnected with the flask is a movable vessel x, adapted by 
accurate grinding to the mouth of the former, and designed to 
contain the liquid whose absorbent power is to be determined. 
This unit bottle as we will call it, has its opening below con- 
tracted to about one-eighth of an inch, so that when filled with 
the liquid and connected in an ‘arene position with the flask, 
as in the diagram, the liquid is in no danger of flowing out. 
When thus inserted in its proper position, it is caieal in place by 
the strong pressure of a steel spring, attached to the central tube 
of the flask, and which by a revolving mention is then brought to 
press by a leather cushion upon its u en his secures the 
rear ay the stopper perfectly sitiglik during the active agita- 
The central tube is in like manner ground to an air-tight joint 
at its insertion into the flask, and the connection is forcibly secur- 
ed by a strong cord wrapped around the neck and then passed 
around a screw peg inserted in a wooden block which is firmly 
cemented to the tube above. To avoid all chance of leakage at 
this and the junction of the unit bottle with the flask, a very del- 
icate coating of tenacious cement made of beeswax, rosin an 
low, is applied to the upper part of the ground surface. This 
from its very minute amount, and its removal from the gas in the 
interior, is incapable of exercising any appreciable absorbent effect. 
Indeed we have found that even with a large mass of this cement 
placed in the flask, the effect is quite insignificant. 
The flask suspended by the horizontal part of the tube just de- 
scribed, hangs, when in its natural vertical position, at such depth 
as to immerse about half the length of the unit bottle. The agi- 
tation is given by a hooked rod which embracing the central neck, 
is moved to and fro longitudinally, and causes the flask to swing 
as rapidly as the operator pleases, the axis of motion being the 
part of the horizontal tube Ey is external to the flexible joint, 
and lies upon the wooden frame near itsend. The rest of the 
horizontal tube is connected with the measuring tube, and firmly 
attached, along with the latter, to the horizontal bar of the front, 
This slides up and down upon the vertical supports, and can be 
adjusted to a proper position sd the mane pins seen in the fig- 
ure, immediately beneath it, can lifted off, carrying the 
measuring tube and flask, To secure vs axis tube from lateral 
motion during the shaking, a wooden block descends by a hinge 
over the flexible joint and this tube, and embracing them 1 in a 
ngit groove roreing them in place, es 
