202 SPECIES NOT 



passed from the Delaware to the Hudson, or 

 vice versd, which it could only have done by 

 passing along the sea-shore, or by leaping over 

 large spaces of terra jirma; that is to say, in 

 both cases it would be necessary to do violence 

 to organization. Now such a supposition is in 

 direct opposition to the immutability of the laws 

 of nature." (Comparative Physiology, by Gould 

 and Agassiz, edited by Dr. Wright, p. 384.) 



Man himself, although the only animal that 

 can live in all, and every region of the globe, is 

 at the same time more or less subject to the law 

 of limitation, as expressed above, and it is singular, 

 as Agassiz has pointed out, that the races of 

 mankind, more or less characterized by certain 

 peculiarities of feature, as the Caucassian, Mon- 

 golian, and African, have their home in those 

 parts of the earth which represent the great zoo- 

 logical regions; the Samoyedes in Asia, the Lap- 

 landers in Europe, and the Esquimaux in Amer- 

 ica, live amid the Arctic fauna?. In South and 

 Central Africa we have the Hottentot and Negro, 

 the inhabitants of Northern Africa are allied to 

 their neighbours in Europe, while the natives of 

 New Holland are u like its animals, the most 

 grotesque and uncouth of all races." 



Other causes have also had great influence in 

 the distribution of animals and plants. "The 

 form of continents, the bearing of the shores, the 

 direction and height of mountains, the mean level 

 of great plains, the amount of water circumscribed 

 by land." The equalizing influence of a large 



