410 LAWS OF MULTIPLICATION. 



mentally opposed. Assuming other things to remain the 

 same — assuming that environing conditions as to climate, 

 food, enemies, &c., continue constant ; then, inevitably, every 

 higher degree of individual evolution is followed by a lower 

 degree of race-multiplication, and vice versd. Progress in 

 bulk, complexity, or activity, involves retrogress in fertility ; 

 and progress in fertility involves retrogress in bulk, com- 

 plexity, or activity. 



This statement needs a slight qualification. For reasons 

 to be hereafter assigned, the relation described is never com- 

 pletely maintained ; and in the small departure from it, we 

 shall find an admirable self-acting tendency to further the 

 supremacy of the most-developed types. Here, however, this 

 hint must suffice : explanation would carry us too far out of 

 our line of argument. For the present it will not lead ns 

 astray if we regard this inverse variation of Individuation 

 and Genesis as exact. 



§ 328. Thus, then, the condition which each race must 

 fulfil if it is to survive, is a condition which, in the nature of 

 things, it ever tends to fulfil. In the last chapter we saw 

 that a species cannot be maintained unless the power to 

 preserve individual life and the power to propagate other 

 individuals vary inversely. And here we have seen that, 

 irrespective of an end to be subserved, these powers cannot 

 do other than vary inversely. On the one hand, given a 

 certain totality of destroying forces with which the species 

 has to contend ; and in proportion as its members have 

 severally but small ability to resist these forces, it is requisite 

 that they should have great ability to form new individuals, 

 and vice versd. On the other hand, given the quantity of 

 force, absorbed as food or otherwise, which the species can 

 uoe to counterbalance these destroying forces ; and in propor- 

 tion as much of it is expended in preserving the individual, 

 little of it can be reserved for producing new individuals 

 and vice versd. There is thus complete accordance between 



