GENERAL LAW OP ANIMAL FERTILITY. 601 



mal kingdom, and which must alike determine the different fer- 

 tilities of different species, and the variations of fertility in the 

 same species, we have now to consider in its application to man- 

 kind. 



[ The remainder of the essay, which as implied, deals with the ap- 

 plication of this general principle to the multiplication of the human 

 race, need not be here reproduced. The subject is treated in full in 

 Part VI.} 



