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eics and varieties, and from the principle of general gradation, that species have
been modified ; and he attributes the modification to the change of circumstances
. The author (1855) has treated Psychology on the principle of the necessary ...
Page I CHAPTER I. VARIATION UNDER DOMESTICATlON. Causes of Variability
— Effects of Habit— Correlation of Growth— Inheritance— Character of Domestic
Varieties — Difficulty of distinguishing between Varieties and Species — Origin ...
... in an analogous manner— Reversions to long lost characters— Summary, . . . .
. 120 CHAPTER VI. DIFFICULTIES ON THEORY. Difficulties on the theory of
descent with modification— Transitions — Absence or rarity of transitional
lug— Fertility of varieties when crossed and of their mongrel offspring not uni
versal— Hybrids and mongrels compared independently of their fertility—
Summary ,217 CHAPTER IX. OK THE IMPERFECTION 07 THE GEOLOGICAL
No one ought to feel surprise at much remaining as yet unexplained in regard to
the origin of species and varieties, if he makes due allowance for our profound
ignorance in regard to the mutual relations of all the beings which live around us.
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