622 
CHEMISTRY: HENDERSON AND COHN 
secondly, because in the Mediterranean, where no deep arctic current 
flows, carbonic acid is escaping from the sea. 
The special features of this movement of carbon dioxide can only be 
discovered through very extensive investigations, but its general charac- 
ter seems to be indicated by the following diagram. 
MOVEMENTS OF CARBON DIOXIDE IN A VERTICAL NORTH-SOUTH PLANE, IN THE 
NORTHERN HEMISPHERE 
These results afford one more instance of similarity between regulatory 
processes in the organism and in the environment. 
I^We are greatly indebted to Dr. Palitzsch for furthering this investiga- 
tion by his invaluable advice. 
^ Sven Palitzsch, Measurements of the hydrogen ion concentration in sea water, Report on 
the Danish Oceanographical Expeditions 1908-10 to the Mediterranean and Adjacent Seas, 
vol. 1, p. 237. 
^ During the early part of this investigation Dr. Palitzsch, as Scandinavian Scholar, was 
at work in the Gibbs Laboratory. 
^ August Krogh, The abnormal CO2 percentage in the air in Greenland and the general 
relations between atmospheric and oceanic carbonic acid, Meddelelser om. Grdnland, No. 25- 
26, p. 434, 1904. 
