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The Dean believes that single species of each genus were created in an
originally highly plastic condition, and that these by intercrossing and by variation
have produced all our existing species. • It is curious how completely my
... 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 ...
Naturalists continually refer to external conditions, such as climate, food, &c, as
the only possible cause of variation. In one very limited sense, as we shall
hereafter see, this may b6 true ; but it is preposterous to attribute to mere external
variations. I will then pass on to the variability of species in a state of nature ; but I
shall, unfortunately, be compelled to treat this subject far too briefly, as it can be
treated properly only by giving long catalogues of facts. We shall, however, be ...
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