CONCLUDING REMARKS. 441 



effects under which those individuals were observed to 

 suffer. 



The following propositions illustrate the manner in 

 which the normal immutability of each species, has 

 been demonstrated by this law, of the complementary 

 nature of the structural integrity, and of the physio- 

 logical integrity of organisms. 



From Darwin's repertory of facts this induction has 

 been made, viz. : 



II. That there has been degeneration in each spe- 

 cies under nature, to the extent of a margin commen- 

 surate with the margin of the possible, positive varia- 

 tion in that species, under Domestication. 



Warrant for this induction, is to be found 



First: In the conditions of the Struggle for Exist- 

 ence, which needs must have been very adverse, if 

 Darwin's graphic description of them is to be received : 



Second: Warrant for the induction, of Degenera- 

 tion under Nature, is to be found in the many rudi- 

 mentary organs which, Darwin says, were once in a 

 fully developed state; and the scope of this degenera- 

 tion may be conceived when Darwin says that these 

 rudiments " imply an enormous amount of modifica- 

 tion," and when he says, that "there is scarcely a 

 single species under nature which is free from such 

 blemishes." 



Third: Degeneration is shown by the many organs 

 which, Darwin declares, have been greatly reduced 

 and simplified by the action of the conditions of Natu- 

 ral Selection: 



Fourth: This degeneration is shown by the many 

 38 



