306 Chemical Notices : — 



the second. By working out according to Mr. CrolFs directions, 

 it is easily found that the change of sea-level which this will 

 produce will consist in a sinking in the first hemisphere and 

 rising in the second, through heights varying according to the 

 same law (that is, simple proportionality to sines of latitudes), 

 and amounting at each pole to 



(l—o))it 



, 



1— cow 



where t denotes the thickness of the ice-crust at the pole ; i the 

 ratio of the density of ice, and w that of sea-water to the earth's 

 mean density ; and co the ratio of the area of ocean to the whole 

 surface. 



2 



Thus, for instance, if we suppose co — -=, and £=6000 feet, 



11 6 



and take - and ^y as the densities of ice and water respectively, 



we find for the rise of sea-level at one pole, and depression at 

 the other, 



1 x -i x 6000 



l"' '? 1' 



3 X 5J 



or approximately 380 feet. 



It ought to be remarked that a transference of floating ice 

 goes for nothing in changing the sea-level, and that in esti- 

 mating the effect of grounded icebergs the excess of the mass of 

 ice above that of the water displaced by it is to be reckoned just 

 as if so much ice were laid on the top of an island. 



XLVL Chemical Notices from Foreign Journals. 

 By E. Atkinson, Ph.D., F.C.S. 



[Continued from p. 144.] 



BEKETOFF has published a work, in the Russian language, 

 on the displacement of some elements by others. The fol- 

 lowing account of his principal results is taken from an abstract 

 of the book, which appeared in the Zeitschrift fur Chemie*. 



The experiments on the relation of hydrogen under high pres- 

 sure towards metallic salts are already partially known. The 

 author made an experiment in which he used a tube bent eight 

 times, in such a manner that four legs were formed. In the first 

 bend a dilute solution of sulphate of silver was placed, in the second 

 * June 1865. 



