11 



control over equatorial latitudes, and that polar glacia- 

 tions may have reached their maximum at a period sub- 

 sequent to the commencement of the disappearance of 

 glaciations in temperate latitudes. 



(e) The accession of solar heat by the trapping pro- 

 cess being the result of a positive difference between the 

 rate of receipt and the rate of loss, and not being a 

 function of the orbital distance, a rise in temperature 

 may as certainly follow in one position as another. 



(f) That glacial conditions although imposed upon 

 lines independent of solar exposure, must have reached 

 their maximum upon areas subject to maximum precip- 

 itation, and as the movement of the atmosphere in tem- 

 perate latitudes is towards the east, the west coasts of con- 

 tinents are more exposed to moist winds and hence were 

 more deeply glaciated than the east coasts. The narrow 

 North American continent was thus more exposed to gla- 

 ciation from the wide Pacific, than was the broad 

 Euroasian continent from the narrow Atlantic. 



(g) That the northern hemisphere of low specific 

 heat has progressed further in climatic development than 

 has the southern hemisphere of high specific heat. 

 Similarly, the Atlantic has been warmed to a greater 

 extent than the Pacific* 



*It will probably be noted that no mention is made of light rays; these 

 can be filtered out by clouds and pass through in greatly diminished in- 

 tensity. It is not considered necessary to discuss their influence at this 

 point, as their effect is slight at temperature approximating the freezing 

 point. The gradual development of visual organs and the development of 

 all other senses prior to that of sight are lines of investigation which the 

 author has not been permitted to make for want of time and means. 



