ZOOGENESIS 



exposed land area under conditions of rapid chemical 

 and physical disintegration. This region includes by 

 far the greater part of all the forests of the world and 

 of the fertile grassy plains. In the sea the region 

 that supports the greatest amount of life is that which 

 receives the drainage from this same area, that is, 

 the north Atlantic and the north Pacific oceans. 

 Here the maximum intensity of life is in bands along 

 the shores, narrow in the south but broadening in the 

 north, lying mostly in water of not more than six 

 hundred feet in depth. 



[57] 



