436 S. S. VISHER SALINITY AS CAUSE OF CLIMATIC CONTRASTS 



and breadfruit found in western Greenland, and several other puzzling 

 questions of paleoclimatology would be easily explained, for such a deep- 

 sea circulation would mean that vast quantities of tropical warmth would 

 be transferred to high latitudes beneath the surface without loss en route. 

 However, there is no direct evidence that an actual reversal has ever 

 taken place. Indeed, Chamberlin, who first suggested the possibility of 

 a reversal, offered it merely as an interesting possibility. Nevertheless, 

 a change in the salinity of the oceans must apparently have had some 

 distinct effects. Though these may have been small, they are not to b(> 

 neglected in any complete study of the climate of the past. 



