PART 1 ON VARIATION UNDER DOMESTICATION,
AND ON THE PRINCIPLES OF SELECTION
An individual organism placed under new conditions 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 develop certain parts.
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) and continues steadily to propagate, by buds, such
When the organism is bred for several generations under new
or varying conditions, the variation is greater in amount and
endless in kind.
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, etc., organs affected and diseases - extent unknown.
A certain degree of variation (Mulle . . .