LECTURE IV 



Summary. Second Group of Facts supporting Experimental Evolution ; 

 Fadts of Domestication of Animals ; their Departure from the 

 original Wild Type as seen in the cases where the latter still exists ; 

 Much more might be done in this way, and many new 

 Resources discovered ; Domestication has caused Animals to vary 

 in all parts of their Organism, from Weight of Brain to Length of 

 Digestive Tract. Third Group of Facts : Cultivation of Plants ; 

 its Influence ; the Departure from the original Wild Type ; Varia- 

 tion in all parts of the Plants from Roots to Flowers ; Numerous 

 Varieties of the commonly-cultivated Vegetables. Fourth Group 

 of Facts : Influence of Environment on Structure ; Closeness of 

 Agreement between Environment and Organism ; Beudant and 

 Raulin's Experiments ; the Author's Experiments ; Dareste and 

 Teratogeny ; Pouchet, Yung ; Facts and Experiments ; Pierre 

 Lesage ; Schmankevitsch ; Weismann's Criticisms. 



WE positively know that some of our domestic 

 animals and cultivated plants were companions of 

 prehistoric man. It even seems that among the 

 older nations, now dead and gone, some animals 

 were subjected to domestication which have since 

 been totally abandoned and allowed to run wild. The 

 beech-marten and other Mustelidae were in part 

 domesticated by the ancient Greeks in order to 



