608 CYRUS F. TOLMAN 
produce so great an increase in the absorption of the CO,, and 
the effect of decreasing tension of atmospheric CO, approaches 
a maximum. 
These facts, therefore, naturally divide the discussion into 
three parts. Under Professor Arrhenius’ postulates as to change 
in temperature and pressure, we shall discuss the relative effect 
of these two opposing factors in the temperate waters whose 
temperature is the average surface temperature of the ocean, 
viz., 15° C. (2) Ditto for the tropical waters whose temper- 
ature is above 15° C. (3) Ditto for the polar waters whose 
temperature is below this. 
> 
6, 
3 
5 
a £ 
FS 
: 
Z a 
Ca (H COs), in omy. per litre 
0 20 #0 60 By Ji [26 
Fic. 4 is from Treadwell’s and Reuter’s dissertation (see reference, p. 603). The 
partial pressure is represented on the ordinate in mm of mercury and the amount of 
calcium bicarbonate dissolved in m. g. in the abscissa. At atmospheric pressure 15° 
C. the amount dissolved in pure water at saturation is 38.5 m. g. per liter, which is 
much less than the amount of bicarbonate in the sea, as we might expect from the 
previous discussion. 
The only experiments which have been made upon sea water 
(and so under the actual conditions of the problem) are repre- 
sented in Fig. 5. Professor Ditmar took a special sample of 
deep ocean water which was so charged with CO, as to have its 
bicarbonate fully saturated with CO,. This he shook violently 
in a bottle constantly renewing the air until there was no more 
