CARBON DIOXIDE OF THE OCEAN 605 
From several hundred determinations of Buchanan, we strike 
diveaverase, Of 45" tree CO. per liter, to, 53.472 CO,” per 
liter of the frst equivalent, z. e., only 84 per cent. of the second 
equivalent is found in the ocean. Mr. Jacobson’s analyses show 
a larger per cent. of the carbonates than were found in the 
Challenger’s samples, which might be expected, as Jacobson’s 
were collected only trom the North Sea into which flow the great 
lime-bearing rivers of northwestern Europe. 
To prove positively that the ocean bicarbonate dissociates 
into carbonate and free CO,, Professor Ditmar shook in the air 
Jom porature. 
Volume dissolved. 
iS 7 tb 14 “A Ld oe 
Fics. I and 2 represent respectively the effect of temperature on the solubility of 
CO, in pure water, and upon the dissociation of Na H CO,. 
Fic. tis taken from table on page 593 and under 760 mm pressure CO,. The 
temperature is recorded on the ordinate, and on the abscissa are the volumes of CO, 
»bsorbed, compared with the volume of water in which it is dissolved. 
a sample of sea water, that had an excess of CO,, and found 
that CO, was given off, and that the ratio of the two equiva- 
lents was 100:84 at 13° C., exactly the same, it happens, as we 
found from averaging Buchanan’s analysis. Therefore we may 
consider it as certain that the largest part of free CO, in the 
