Chemical and Physical Notes 



45 



crystals is a feature of salts and solutions which has no 

 analogy in the physics of gases. 



The following table gives the temperature at which ice 

 melts in solutions of various chlorides. The concentration of 

 the brines is indicated by the percentage of chlorine by weight 

 in the solution. It is taken from the writer's paper 'On Ice and 

 Brines.' 



TABLE III. 



In dealing with sea- water ice, it is well for the chemist 

 and physicist to confine his attention in winter-quarters to 

 ice which he has seen freeze and with the whole of whose 

 history he is himself acquainted. Old sea-ice is nothing but 

 a curiosity. Every lump of it in a pack has a different 

 composition, and when the composition of a hundred lumps 

 is known, unless their history is also known, it does not 

 really advance our knowledge. 



Everything connected with the natural history of young 

 ice its birth, its growth, and its decay is of interest, and 

 its study, in the light of the foregoing remarks, will afford 

 continual and interesting occupation. 



Land-Ice and the Mechanics of Glaciers. If ice is an 

 important feature of the sea in Antarctic regions, it is a still 



