606 CYTOSOL MAW, 
ocean is held as the second equivalent of bicarbonate, and that 
this is held in equilibrium with the gas in the air. 
We know then from the above that the dissociation of the 
bicarbonate is a function of the temperature, and also of the 
partial pressure of the superincumbent CO,. The solubility of 
CO, as agas not attached to form bicarbonate, is also a 
function of temperature and pressure, but that these functions 
are not the same, may be seen from an inspection of the 
Discociation Jension, in mm Niercary. 
Loo 20 400 Sto ba0 
Fic. 2 is plotted from Dr. Dibbett’s tables.* On the ordinate are the temperatures 
and on the abscissa the increase of the dissociation of the Na H CO, in mm of mer- 
cury which represents the loss of the second equivalent of CO, from the solution. 
accompanying curves. Professor Ditmar has experimented upon 
the effect of changes of partial pressure and temperature upon 
the CO, in the ocean. This includes both the effect upon the 
portion simply dissolved and that as second equivalent of 
bicarbonate. We shall discuss these results under Professor 
Arrhenius’ hypothesis of lowering the surface temperature to 
*Ueber die Loslichkeit und.die Dissociation des sauren kohlens Kaliumes, Natri- 
urns und Ammomiums, Journal fiir praktische Chemie, neue Folge 10, 1879, pp. 417- 
444. 
