SELECTION 155 



also IIQT$ infinitely -**-! o,fifi ftnrl complex are, the 



nthej ajld to their physical renditions of lifpi 

 and consequently what infinitely varied 

 diversities of structure might be of use to 

 each being under changing conditions of life, 

 can it be thought improbable, seeing that 

 variations useful to man have undoubtedly 

 jpccujEfii tfrnt nthfT ynrmtiorfs r usftftjL in 

 SQiq.e _ way_ *^ ^q^h bring -i t^.gr^t and 

 CTJOipl^^ hftttlft of lifrj fihunlH nrmr in the. 

 nqnrse 9f many generations? And if such do 

 occur, can we doubt (remembering that many 

 more individuals are born than can possibly 

 survive) that individuals _ having* any ....&$- 

 lightj ovrr 



and 



ing tihpir ^ i<rir l^ On the other 

 hand, we may feel sure that a.nv variation in 

 thn Innat^^ip^rp^ injiirjons wo^jd hp jnevi- 



\ n 1 v 



Tijis 



of injuriou 



natural selection, or, less metaphorically, the 

 yivftl of the fittest, the one term referring 

 mainly to the process, the other to the result. 

 The probable course of natural selection may 

 be understood from the case of a country 

 undergoing change of climate. The pro- 

 portional numerical strengths of its species 



