84 



HYDROGRAPHY. 



According to the investigations of Professor Pettersson, the proportion between the amount of 

 sulphuric acid and the amount of chlorine in sea-ice differs considerably, but still it is to be observed 

 that this proportion is greater than the corresponding one in sea-water. In some samples, it is even 

 so great that the coefficient of chlorine, as a necessity, must be greater in these samples than in the 

 ocean-water, and the consequence of this is, that where such ice is melting, we shall have a mixture 

 with a great coefficient of chlorine, as in water from the coasts. 



Owing to the fact of the coefficient of chlorine being such a compound quantity, it seems to 

 me for that reason to be unfit to give distinctive results, even if in some directions it elucidates some 

 characteristic features of the water. And when S is reduced by determination of the different constitu- 

 ents, why then conceal in the coefficient of chlorine all the characterising elements formed by the 

 majority of these separate constituents. 



In the tables of the analyses of gases are entered the time and the place of every single 

 sample of water. The appellations are the same as those used in the table of the stations. Further- 

 more the temperature and salinity of the water as well as the pressure of air in mm. of mercury 

 pressure are entered. Under N will be found in the first column the values of a, a meaning the 

 amount of nitrogen reduced to cubic centimetres at o° and a pressure of 760 mm., which one litre of 

 water — of the same salinity and temperature as the sample that has been examined — contains in 

 a dissolved state when it is saturated with atmospheric air under a dry pressure of 760 mm.; these 

 values are taken from Hamberg's tables (Bihang til Kgl. Svenska Vet.-Akad. Handlingar. Bd. 10 Nr. 13 

 pag. 22). In the second column is entered under the appellation 3, the amount of nitrogen reduced 

 to o° and a pressure of 760 mm., which is necessary to saturate water — of the the same salinity and 

 temperature as the examined sample — under the pressure of air for the time being. In the third 

 column, under c, is entered the quantity of nitrogen determined by the analysis, which 



