Carbonic Acid by Saline Solutions. 

 TABLE IV. 



495 



Determinations of the absorption-coefficient o a 0*205 per cent, solution 

 of gypsum for carbonic acid at the temperatures and pressures 

 indicated. V=48-759 c. c. 



Comparison of the results of series I. and II. shows the effect which 

 these sulphates have in altering the power of absorption of water for 

 carbonic acid, when they are allowed sufficient time for the reaction. 

 The subject of the absorption-power of saline solutions is one of much 

 importance, and affords an almost inexhaustible field for research, when 

 the effect of varying the nature of the salt, the strength of the solution, 

 the temperature, the pressure, and the duration of the action of the solu- 

 tion on the gas are taken into account. I hope, at some future time, to 

 be able to resume this interesting inquiry. 



H.M.S. ' Challenger/ Simon's Bay, Nov. 4, 1873. 



