SPECIALITIES OF THESE RELATIONS. 469 



this cannot be due simply to plethora joined with rest. These 

 cases are given as illustrating the conditions under which 

 extreme exaltations of fertility become possible. Their mean- 

 ings, thus limited, are clear, and completely to the point. We 

 see in them that the devotion of nutriment to race-preserva- 

 tion, is carried furthest where the cost of self-preservation 

 is reduced to a minimum; and, conversely, that nothing 

 is devoted directly to race- preservation by individuals on 

 which falls an excessive expenditure for self-preservation and 

 preservation of other's offspring. 



