438 



THE PHYSICAL GEOGRAPHY OF THE SEA. 



pieted for all parts of the ocean, but as far as they have been con- 

 structed the facts they utter are in perfect agreement with the 

 terms of this corollary. 



820. These premises being admitted, we may ascend another 

 Atmospherical circu- rouud ou this ladder, and argue that, since the at- 



lation more active in ^ . ^ . 



the southern than in mosphcrc movcs morc Driskly and m more con- 



the northern hemi- , . . ^ , i n - 



i^phere. staut strcams through its general channels oi circu- 



lation in the southern than it does through them in the northern 

 hemisphere ; and that, since it is not arrested in its courses by 

 calms as often in the former as it is in the latter, neither should 

 it be turned back by the "way, so as to blow in gales from the di- 

 rection opposite to that in which the general circulation carries it. 

 The atmosphere, in its movements along its regular channels of 

 circulation, may be likened, that in the southern hemisphere to a 

 fast railway train ; that of the northern to a slow. The slow train 

 may, when "steam is up," run as fast as the fast train, but it is not 

 obliged to get through so quick ; therefore it may dally by the 

 way, stop, run back, and still be through in time. Kot so the fast ; 

 it has not time to stop often or to run back far: neither have the 

 counter- trades of the south time to blow backward ; consequently, 

 such being the conditions, we should also expect to find in the ex- 

 tra-tropical south a gale with easting in it much more seldom than 

 in the extra-tropical north. 



821. We shall appeal to observations for the correctness of this 

 Gales in the two hemi- conjccturc, and claim for it, also, as presently will 

 ppheres. appear, the dignity of an established truth. 



Average Number of Gales {to the 1000 Observations) ivith Easting and ivith Westing in 

 them between the corresponding Parallels in the North and South Atlantic^ as shown 

 by the Storm and Rain Charts. 



Thus the Storm and Eain Charts show that between the parallels 

 of 40° and 55° there were in the northern hemisphere 83,515 ob- 



