290 Miscellaneous Intelligence. 
will keep its character even in high northern latitudes. In the longi- 
tude of Greenland, and more than one hundred miles to the south of 
the southernmost point of that large tract of land, sea water contains 
only 35-0 in 1,000 parts. In going from this point towards the north- 
west, it decreases constantly; and in Dover Straits, at a distance of 
about forty miles from the land, it only contains 32:5 parts of salt in 
1,000 parts of sea water. ‘This character seems to remain in the cur- 
rent which runs parallel to the shores of North America; and at N. 
lat. 434°, and W. long. 464°, the sea water contained only 33°8 parts of 
salt... .'hus tropical and polar currents’ seem not only to be different in 
respect to their temperature, but also in the quantity of salt which they 
contain; and thence it follows, again, that while the quantity of water 
ied 
which rain and the rivers give back to the sea, the reverse takes place 
in the polar seas, where evaporation is very small and the condensation of 
vapor very great. ‘The circulation must on that account be such, that 
a part of the vapor which rises in tropical zones will be condensed in 
polar regions, and, in the form of polar currents, flow back again to 
warmer climates. Although my analyses are only made on water from 
direction towards the west, and thus be driven towards the eastern 
shores of the continents; while any tropical current flowing towa 
the north will, according to the same laws of rotation, take a direction 
towards the western shores of the continents. This is at present the 
case in the Atlantic Ocean; and its effects upon the shores of Lurope, 
which are surrounded by warm water from a branch of the tropical 
current, produce a mild and moist climate. The water of the different 
10,000 to 1,193. In the German Ocean, according to ten analyses, it 
is 10,000 to 1,191. In Davis's Straits, according to the mean of five 
analyses, it is 10,000 to 1,220. In the Kattegat, according to the mean 
