357 



approximately computed from Bambergs figures. He finds that 



if the salinity is diminished by the addition of distilled water 



from 35.1 to 26.6 or 17.8 ^/ou the coefficients of absorption 

 must be multiplied by 1.05 or l.io respectively. 



2. The tensions at 15° of samples of the standard water, 

 containing varied quantities of carbonic acid, were determined, 

 according to the method described above, 

 by shaking with air and subsequent ana- 

 lysis in the HALDANE-apparatus of this air. 

 The determination was made twice with 

 each sample of water. A recipient {b 

 on the adjoined figure) of 225 cc.'s capacity, 

 provided with two stopcocks, was there- 

 upon filled with the water; care being 

 taken to avoid loss or absorption of car- 

 bonic acid. This recipient was connected 

 with the ordinary recipient a of the mer- 

 cury-pump containing 10 cc. ofdecinormal 

 muriatic acid. When this had been evacua- 

 ted the tap с was opened, and the gas now 

 liberated pumped out and collected. The 

 quantity of carbonic acid in the collected 

 gases was determined by analysis, and 

 the mixture of seawater and muriatic acid '^" 



was titrated with baryta for the determination of the alkalinity. 



The alkalinity was found to be remarkably low, viz. ^4 ==22.72 

 cc. of C'Og per 1. and 1 thouglit at first that I must have com- 

 mitted an error in the determination. A repeated determination 

 of the normal acid, according to the extremely accurate method 

 described by Sørensen ^), and a revision of the whole method 



^) "Ueber die Anwendung des normalen Natriumoxalats in der Massanalyse». 

 Fresenius' Zeitschr. f. unalyt. Chemie Bd. 42 p. 333 and p. 512. 



