PART I. 



i. (ON VARIATION UNDER DOMESTICATION, AND 

 ON THE PRINCIPLES OP SELECTION.) 



AN individual organism placed under new con- 

 ditions [often] sometimes varies in a small degree 

 and in very trifling respects such as stature, fatness, 

 sometimes colour, health, habits in animals and 

 probably disposition. Also habits of life develope 

 certain parts. Disuse atrophies. [Most of these 

 slight variations tend to become hereditary.] 



When the individual is multiplied for long periods 

 by buds the variation is yet small, though greater 

 and occasionally a single bud or individual departs 

 widely from its type (example) 1 and continues 

 steadily to propagate, by buds, such new kind. 



When the organism is bred for several genera- 

 tions under new or varying conditions, the variation 

 is greater in amount and endless in kind [especially 2 

 holds good when individuals have long been exposed 

 to new conditions]. The nature of the external 

 conditions tends to effect some definite change in all 

 or greater part of offspring, little food, small size- 

 certain foods harmless &c. &c. organs affected and 

 diseases extent unknown. A certain degree of 



1 Evidently a memorandum that an example should be given. 



2 The importance of exposure to new conditions for several generations 

 is insisted on in the Origin, Ed. i. p. 7, also p. 131. In the latter passage 

 the author guards himself against the assumption that variations are " due 

 to chance," and speaks of "our ignorance of the cause of each particular 

 variation." These statements are not always remembered by his critics. 



D. 1 



