10 CONTROLLED NATURAL SELECTION 



have an advantage over other pairs, in which 

 the chance of male and female surviving is 

 equal. 



If the female be destroyed, the character of 

 the female and the male will not be repro- 

 duced ; at any rate the chance of his, the 

 male, reproducing himself is less than males 

 in general, for he must find another mate. 



If the male be destroyed, it by no means 

 follows that the male characters will be de- 

 stroyed, for it is likely that he has already 

 fertilised the female, especially as the society, 

 a pair in the majority of animals, only occurs 

 during the breeding season. 



Directly the percentage of males in the population 

 become much reduced polygamy results, and the value 

 of the male will rise until it equals that of the female : 

 directly this balance is struck, further evolution of the 

 male, making him more liable to be selected, will cease. 

 Similarly with any other society of unequally valuable 

 individuals, they will become marked according to their 

 value, and in such a way that Natural Selection will be 

 controlled and compelled to take the less valuable rather 

 than the more valuable. 



A review of the exposition. Facts : 



1. Individuals of a species not of equal 

 value : male and female, old and young. 



2. Individuals form themselves into so- 

 cieties : pairs, families, herds, &c. 



