PRINCIPLES

OF

GEOLOGY.

VOL. III.

LONDON:

Printed by A. SPOTTISWOOde, New-Street-Square.

"The inhabitants of the globe, like all the other parts of it, are subject to
change. It is not only the individual that perishes, but whole species."
"A change in the animal kingdom seems to be a part of the order of nature,
and is visible in instances to which human power cannot have extended."

PLAYFAIR. Illustrations of the Huttonin Thecry § 413.

IN THREE VOLUMES.

VOL. III.

THE SIXTH EDITION.

LONDON:

JOHN MURRAY, ALBEMARLE STREET.

550

L984 ed. 6 e.2

765859

CONTENTS

OF

THE THIRD VOLUME.

BOOK III.

CHAPTER I.

CHANGES OF THE ORGANIC WORLD NOW IN PROGRESS.

Division of the subject - Examination of the question, Whether

species have a real existence in nature? — Importance of this

question in geology Sketch of Lamarck's arguments in

favour of the transmutation of species, and his conjectures

respecting the origin of existing animals and plants His

theory of the transformation of the orang-outang into the

human species
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CHAPTER II.

TRANSMUTATION OF SPECIES

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continued.

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Recapitulation of the arguments in favour of the theory of trans-

mutation of species - Their insufficiency – Causes of diffi-

culty in discriminating species — Some varieties possibly more

distinct than certain individuals of distinct species- Vari-

ability in a species consistent with a belief that the limits of de-

viation are fixed. No facts of transmutation authenticated

Varieties of the Dog - the Dog and Wolf distinct species —

Mummies of various animals from Egypt identical in character

with living individuals - Seeds and plants from the Egyptian

tombs - Modifications produced in plants by agriculture and

gardening

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