Lerrs anp Bhake—On Atmospheric Carbonic Anhydride. 
445 
tube turned, so as to fill the latter accurately to the mark with 
carbonic anhydride at the existing temperature and pressure. 
It only remained to transfer this measured volume of the gas to 
the receiver of purified air by precisely the same manipulation as 
was employed for filling the meauring pipette with mercury. 
Z 
NVM = 
osm 
sS 
S 
y 
it 
ROY 
{QUO AU TOA ATAAMNTATNNNNS 
Ey 
Qs 
Fic. 3. 
By this means, as the capacity of the receiver and its attached 
tubes had been previously ascertained, a mixture of pure air and 
carbonic anhydride in known proportions was obtained, ready 
