156 
Proceedings of Royal Society of Edinhurgh. [feb, 6, 
Glohigerina Ooze, I. 
At 4 tons pressure, . 
At 2 „ 5, 
At atmospheric pressure, 
Amount of 
CaC03 dissolved 
per grm. , COg 
taken. 
Difference 
from 
Extremes. 
•1121 ±*03 
•1019 
•0553 ± -0009 
GloJ)igerina Ooze, II. 
At 4 tons pressure, . 
At atmospheric pressure. 
Coral Sand, I. 
At 4 tons pressure, . 
At atmospheric pressure. 
•0846 
•0252 
•1155 
•0419 
±•009 
±•0017 
±•015 
± -0006 
Pteropods. 
At 4 tons pressure, . . •lOlS 
Crystal of Iceland Spar (XXIV.- 
XXVII.). 
At atmospheric pressure, • ^0050 
± -0018 
Crystal, ground to coarse powder. 
At atmospheric pressure, . ^03 2 2 
The disparity between the various results obtained in the pressure 
experiments I am unable to account for satisfactorily. Xevertheless, 
the amount of carbonate of lime dissolved at a pressure of 4 tons 
per square inch, is so much greater than the amount dissolved at 
the ordinary pressure, that I think it justifies the conclusion that 
the effect of pressure is to increase the rate of solution; or, in other 
words, that the chemical activity of a solution of carbonic acid is 
increased by pressure. 
It is to he noted, that although these results may indicate that 
the solution of carbonate of lime in carbonic acid water is more 
rapid under high pressures, it by no means follows that the solu- 
bility is greater than at the ordinary pressure {ceteris paribus). 
Schloesing and other investigators have shown, that in order to get 
