APPENDIX 



The origin of structural variations in living organisms, 

 and their adaptability to the environment. 



DURING the first half of the nineteenth century 

 naturalists had become dissatisfied with the then 

 current ideas regarding the origin of species. 

 Lamarck completed his well-known work 

 :< Philosophic Zoologique " in the year 1809. 

 He believed in the spontaneous generation of 

 living organism from inorganic matter; that 

 life consists of an order, and state of things 

 which permit of organic movements, and that 

 these movements are the result of the action 

 of a stimulus which excites them. He held that 

 a progressive change from lower to higher 

 orders of beings had been and was constantly 

 taking place, and that to effect these changes 

 "time and favourable conditions are the two 



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