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ADDITIONS AND CORRECTIONS

TO THE SIXTH EDITION.

NUMEROUS Small corrections have been made in the last and present editions on various subjects, according as the evidence has become somewhat stronger or weaker. The more important corrections and some additions in the present volume are tabulated on the following page, for the convenience of those interested in the subject, and who possess the fifth edition. The second edition. was little more than a reprint of the first. The third edition was largely corrected and added to, and the fourth and fifth still more largely. As copies of the present work will be sent abroad, it may be of use if I specify the state of the foreign editions. The third French and second German editions were from the third English, with some few of the additions given in the fourth edition. A new fourth French edition has been translated by Colonel Moulinié; of which the first half is from the fifth English, and the latter half from the present edition. A third German edition, under the superintendence of Professor Victor Carus, was from the fourth English edition; a fifth is now preparing by the same author from the present volume. The second American edition was from the English second, with a

few of the additions given in the third; and a third American edition has been printed from the fifth English edition. The Italian is from the third, the Dutch and three Russian editions from the second English edition, and the Swedish from the fifth English edition.

Fifth Sixth Edition. Edition.

Chief Additions and Corrections.

Page

Page

vol. i.

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Influence of fortuitous destruction on natural selection.
On the convergence of specific forms.

Account of the Ground-Woodpecker of La Plata
modified.

On the modification of the eye.

Transitions through the acceleration or retardation of the period of reproduction.

The account of the electric organ of fishes added to. Analogical resemblance between the eyes of Cephalopods and Vertebrates.

Claparède on the analogical resemblance of the hair-
claspers of the Acarida.

The probable use of the rattle to the Rattle-snake.
Helmholtz on the imperfection of the human eye.
The first part of this new chapter consists of portions,

in a much modified state, taken from chap. iv. of
the former editions. The latter and larger part is
new, and relates chiefly to the supposed incom-
petency of natural selection to account for the
incipient stages of useful structures. There is
also a discussion on the causes which prevent in
many cases the acquisition through natural selec-
tion of useful structures. Lastly, reasons are
given for disbelieving in great and sudden modifi-
cations. Gradations of character, often accom-
panied by changes of function, are likewise here
incidentally considered.

The statement with respect to young cuckoos ejecting their foster-brothers confirmed.

On the cuckoo-like habits of the Molothrus.

On fertile hybrid moths.

The discussion on the fertility of hybrids not having been acquired through natural selection condensed and modified.

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326

28

377

81

402

107

440

148

463

172

505 218

516

232

518

236

520 237

521 240 541 262 547 262

552

275

568

293

572

Chief Additions and Corrections.

On the causes of sterility of hybrids, added to and corrected.

Pyrgoma found in the chalk.

Extinct forms serving to connect existing groups.
On earth adhering to the feet of migratory birds.
On the wide geographical range of a species of
Galaxias, a fresh-water fish.

Discussion on analogical resemblances, enlarged and
modified.

Homological structure of the feet of certain marsupial animals.

On serial homologies, corrected.

Mr. E. Ray Lankester on morphology.

On the asexual reproduction of Chironomus.
On the origin of rudimentary parts, corrected.
Recapitulation on the sterility of hybrids, corrected.
Recapitulation on the absence of fossils beneath the
Cambrian system, corrected.

Natural selection not the exclusive agency in the
modification of species, as always maintained in
this work.

297 The belief in the separate creation of species generally held by naturalists, until a recent period.

"But with regard to the material world, we can at least go so far as this-we can perceive that events are brought about not by insulated interpositions of Divine power, exerted in each particular case, but by the establishment of general laws."

WHEWELL: Bridgewater Treatise.

"The only distinct meaning of the word 'natural' is stated, fixed, or settled; since what is natural as much requires and presupposes an intelligent agent to render it so, i.e., to effect it continually or at stated times, as what is supernatural or miraculous does to effect it for once."

BUTLER Analogy of Revealed Religion.

"To conclude, therefore, let no man out of a weak conceit of sobriety, or an ill-applied moderation, think or maintain, that a man can search too far or be too well studied in the book of God's word, or in the book of God's works; divinity or philosophy; but rather let men endeavour an endless progress or proficence in both." BACON: Advancement of Learning.

Down, Beckenham, Kent,

First Edition, November 24th, 1859.

Sixth Edition, Jan. 1872.

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