40 THE ATLANTIC. [ CHAP. I. 
been wholly expelled, the receiver is sealed up at the lower con- 
traction, and the operation ended. 
The arrangement employed for boiling the carbonic acid out 
of sea-water is represented in Fig. 4. 
y 
Mo 
TM 
ll 
| 
in 
li 
Uj Is 
ET 
Fig. 4.—The Carbonic-acid Apparatus. 
The flask @ has a capacity of about 500 ce., and receives the 
sea-water to be operated upon usually to the amount of 200 to 
250 ce. 
pass two tubes; one, reaching to the bottom, communicates 
with the atmosphere by means of the soda-lime tube f, to which 
it is attached by a flexible tube; the other, opening but little 
below the cork, communicates with the condenser 0, a cylindric- 
It is closed by an india-rubber cork, through which 
