VEGA-EXPEDITIONKNS VETENSKAPLIGA ARBETEN. 



307 



Pbysical cou<Ulious of tho sample, etc. 



Hexagonal cry stals resembling snow-| 

 flakes taken from the surface of newly/ 

 frozen ice J 



»Rossol» in needles 



a slight quantity of »Rossol» collected 

 on the ice 



It is interesting to follow the increasing concentration of 

 the overflowing waters and briiies with the winter cold. We 

 know, that such brines have been used at several localitics of 

 the KSiberian coast in the fabrication of salt. * From the ana- 

 lyses in table 2, of this chapter, we see, that this method of 

 fabrication has its drawbacks (at least theoretically). By con- 

 centration by cold the proportion of sodium is diminished 

 and the amoinit of magnesium increased in the brine. 



Ice formed during the winter 1878—79. 



^ Soumise å la congélation Teau de mer fonrnit de la glace pure, et la 

 partie restée liquide se concentre. On finit par avoir une eau tres chargée, 

 dont on achéve la concentration dans des chaudiéres. On obtient ainsi un 

 sel impure . . . (Extrait from Wiirtz' Dictionnaire de Chimie.) 



