Carbonic Acid by Saline Solutions. 



493 



The detailed results are given in four Tables. In the first are given the 

 original volumes of the carbonic acid used in each series, with the data 

 for finding the same. In columns 1 and 2 are found the volumes used 

 in series I. and II. respectively for sulphate of magnesia ; in column 3 

 is the volume for the sulphate-of-lime experiments. 



TABLE I. 



Table giving the original volumes of carbonic acid used in the three 

 series of experiments I., II., and III. 



In series III. (Table IV.) with sulphate of lime, and in series I. 

 (Table II.) with sulphate of magnesia, the readings were made without 

 loss of time, the pressure being successively increased for each experi- 

 ment. In series II. (Table III.) particular attention was paid to the 

 length of time this gas and solution were in contact at the different 

 pressures, and for each experiment the pressure was successively 

 diminished. They were left in contact for nine days at the highest 

 pressure (column 1) before reading; No. 2 was read twenty-two hours 

 later, No. 3 forty-one hours later than No. 2, No. 4 twenty-five hours 

 later than No. 3, and No. 5 after the lapse of some days, 



TABLE II. 



Determinations of the absorption-coefficient of a 1*23 per cent, solution 

 of crystallized sulphate of magnesia for carbonic acid at the tem- 

 peratures and pressures indicated. V= 46-509 c. c. 



