67개의 결과 중 1 - 5개
... and modification of species ; and supports this doctrine by many original and
valuable observations. Charles Darwtm Down, Bromlet, Kent, Feb. 1860.
CONTENTS. lmoDUCTion, ...... . Page I CHAPTER I. VARIATION UNDER
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 ...
TT CHAPTER V. LAWS Of Y A R"I A T I O W . Effects of external conditions — Use
and disuse, combined with natural selection organs of flight and of vision—
Acelimatisation— Correlation of growth-- Compensation and economy of growth
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
... parts of the same individual — Embrtoloor, laws of, explained by variations not
supervening at an early age, and being inherited at a corresponding age —
Rudimintart OMUI ; their origin explained— Summary, . . . . .351 CHAPTER XIV.
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