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\ By the tame Author. / _ . THE EXPRESSION OF-THE'EMOTIONS IN MAN AND

ANIMALS. Write Thousand. With Illustrations. Crown 8vo. i2s. Murray.

THE DESCENT OF MAN AND SELECTION IN RELA-
TION TO SEX. Eighth Tlumsand. 2 vols, 8vo. 24s. Murray.

THE VARIATION OF ANIMALS AND PLANTS UNDER

DOMESTICATION. Third Thousand. Illustrations. 2 vols 8vo. 28«.

Murray.

A NATURALIST'S VOYAGE ROUND THE WORLD; or,
A Journal Of Researches Into The Natural History And Geology Of The
Countries Visited. Eleventh Thousand. Post 8vo. 9s. Murray.

THE VARIOUS CONTRIVANCES BY WHICH BRITISH

AND FOREIGN ORCHIDS ARK FERTILISED BY INSECTS; and the
Good Effects Of Crossing. Woodcuts. Post 8vo. 9s. Murray.

THE STRUCTURE AND DISTRIBUTION OF CORAL

REEFS. Smith; Elder, & Co.

GEOLOGICAL OBSERVATIONS ON VOLCANIC ISLANDS.

Smith, Elder, & Co.

GEOLOGICAL OBSERVATIONS ON SOUTH AMERICA.

Smith, Elder, 4; Co.

A MONOGRAPH OF THE CIRRIPEDIA. Illustrations.

2 vols. 8vo. Ray Society. Hardwicke.

THE MOVEMENTS And HABITS Of CLIMBING PLANTS.

Woodcuts. Williams & Norgate,

FACTS AND ARGUMENTS FOR DARWIN. By Fritz

Muller. From the German, with Additions by the Author, Translated by
W. S. Dallas, F.L.S. Woodcuts. Tost 8vo. 6s. Murray.

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LONDON: PRINTED BY WILLIAM CLOWES AND SONS, STAMFORD STBKET
AND CHARING CROSS.

CONTENTS.

CHAPTER X.

On The Imperfection Of The Geological Record.

On the absence of intermediate varieties at the present day — On the

nature of extinct intermediate varieties; on their number — On

the lapse of time, as inferred from the rate of denudation and of

deposition — On the lapse of time as estimated by years — On the

poorness of our palseontological collections — On the intermittence of

geological formations — On the denudation of granitic areas — On the

absence of intermediate varieties in any one formation — On the sudden

appearance of groups of species — On their sudden appearance in

the lowest known fossiliferous strata — Antiquity of the habitable

earth Page 264-289

CHAPTER XI.

On The Geological Succession Of Organic Beings.

On the slow and successive appearance of new species — On their different

rates of change — Species once lost do not reappear — Groups of species

follow the same general rules in their appearance and disappearance

as do single species — On Extinction — On simultaneous changes in

the forms of life throughout the world — On the affinities of extinct

species to each other and to living species — On the state of develop-

ment of ancient forms — On the succession of the same types within

the same areas — Summary of preceding and present chapters 290-315

CHAPTER XII.

Geographical Distribution.

Present distribution cannot be accounted for by differences in physical

conditions — Importance of barriers — Affinity of the productions of

the same continent — Centres of creation — Means of dispersal, by

changes of climate and of the level of the land, and by occasional means

—Dispersal during the Glacial period — Alternate Glacial periods in

the north and south 316-342

CHAPTER XIII.

Geographical Distributioncontinued.

Distribution of fresh-water productions — On the inhabitants of oceanic

islands — Absence of Batrachians and of terrestrial Mammals—iOn

the relation of the inhabitants of islands to those of the nearest main-

land — On colonization from the nearest source with subsequent modi-

fication — Summary of the last and present chapters .. .. 343-362

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