Description of an Eudidmeter. . 385 
accurately graduated into 100 equal parts. 
This tube is fitted by grinding into the 
neck of a bottle, capable of holding two or 
three ounce measures of water, and having, 
near the bottom, another opening or neck, 
which is occasionally closed by a glass stop- 
per. The bottle being filled with the eudio- 
metric liquid, the tube containing the gas 
under examination is next put into its place; 
and. on inverting the apparatus, the gas 
ascends into the bottle, where it is briskly 
agitated in contact with the liquor. An ab- 
sorption takes place ; and, to supply this, the 
stopper is taken out ander water, which 
rushes into the bottle. The agitation, and 
opening of the stopper, are renewed alter- 
nately till no farther diminution is produced 
in the gas. | 
To this instrument, though very simple and 
ingenious, there are several objections: For 
Ist. by the absorption of. part of the gas, the 
remainder becomes of less density, and is, 
therefore, iess easily taken up by the liquid. 
2dly. By the repeated admission of water, 
the eudiometric liquor becomes much weaker 
towards the close of the process, when its 
unimpaired strength is most wanted. 3rdly. 
If any defect exists in the joints of the vessel, 
ac 
