224 Seientifie Intelligence. 
form. It is impossible that this immense mass m water, 
extending to such a depth in the North Atlantic, could have been 
brought from equatorial regions by means of gravitation. And, 
eater. . Ca 
be aware of this difficulty besetting sha eae: and meets it by 
stating that “the upper stratum of the North Atlantic is not 
nearly as much cooled down by its limited polar underflow, as 
that of the South Atlantic is by the vast movement of antarctic 
water which is constantly taking place toward the equator.” But 
this “ vast movement of antarctic water” necessarily implies a vast 
counter-movement of warm surface-water. So that if there 18 
more polar water in the South Atlantic to produce the cooling 
effect, there should likewise be more warm water to be cooled. 
According to the wind theory of oceanic circulation the explan- 
ation of the whole phenomena is simple and obvious. It has 
it receives from the sun. The reason why the warm ce strata 
are so much thicker on the North Atlantic than on the equato 
