Contents 



the variation between one animal and another which 

 gives the breeder his opportunity. Reads Malthus on 

 Population, a work which points out the keen struggle 

 for existence and that favourable variations tend to be 

 preserved. In 1S42 draw", up a brief abstract of the 

 theory of "natural selection." In 1856 begins an 

 elaborate work on the same theme, but in 1858, hearing 

 that Wallace has written an essay advancing an inde- 

 pendent theory of natural selection, oilers a summary 

 of his argument to the Linnean Society of London. 

 Writes "The Origin of Species," which is published 

 most successfully, November, 1859 35 



DARWIN, CHARLES 



The Descent of Man: the Argument 

 in Brief. 



Since evolution is probable for all other animals, it is 

 probable for man. The human form has so much in 

 common with the forms of other animals that com- 

 munity of descent is strongly suggested. Man, like 

 other creatures, is subject to the struggle for existence. 

 Evidence shows that it is likely that man is descended 

 from a tailed and hairy quadruped that dwelt in trees. 

 Man's mental power has been the chief factor in his 

 advance, especially in his development of language. 

 Conscience is due to social instincts, love of approbation, 

 memory, imagination and religious feeling. Sexual 

 selection in its effects upon human advancement. . . 45 



WALLACE, ALFRED R. 



Mimicry and Other Protective Resem- 

 blances Among Animals 



The colours of animals are useful for concealment from 

 their prey, from the creatures upon which they prey. 

 The lion is scarcely visible as he crouches on the sand 

 X 



