34 

 iii. The Theory of Selection. 



Charles Darwin. 



The voyage in the Beagle (183 1.) 



L yell's Geology. 



The fauna of the Pampas. 



The South American affinities of the productions 

 of the Galapagos and their relations to one 

 another. 



Malthus on population (1803). 



Alfred Russell Wallace. 



The journey to the Malay Archipelago. 



The paper of 1855 — "Every species has come 

 into existence coincident both in space and 

 time with a preexisting, closely allied species." 



The discovery of the principle of the survival of 

 the fittest, February (1858). 



Darwin and Wallace (1858). 



Origin of Species (1859). 



The cue furnished by Malthus and Franklin 

 (1751)- 



The theory of natural selection stated. 

 The tendency to multiply. 

 Heredity and variation. 

 The struggle for existence. 

 The survival of the fittest. 

 The .struggle against enemies. 

 The struggle against physical conditions. 



