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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 Eng

lish 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

Chief Additions and Corrections.

Edition. Edition.

Page £ 100 106 158 156 220 221 225 227 230 233 231 234 233 237 234 239 248 254 248 254 255 262 268 333 270 334

vol. ii. 307 9 319 22

Influence of fortuitous destruction on natural se-
On the convergence of specific forms.
Account of the Ground-Woodpecker of La Plata
On the modification of the eye.
Transitions through the acceleration or retarda-
tion of the period of reproduction.
The account of the electric organ of fishes added to.
Analogical resemblance between the eyes of Cepha-
lopods and Vertebrates.
Claparède on the analogical resemblance of the
hair-claspers of the Acaridae.
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 por-
tions, 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
incompetency 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 selection of useful structures. Lastly,
reasons are given for disbelieving in £ and
sudden modifications. Gradations of character,
often accompanied 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.

E', ', Chief Additions and Corrections. * | *: 826 28 ||On the causes of sterility of hybrids, added to and corrected. 377 81 | Pyrgoma found in the chalk. 402 107 | Extinct forms serving to connect existing groups. 440 148 || On earth adhering to the feet of migratory birds. 463 172 ||On the wide geographical range of a species of Galaxias, a fresh-water fish. 505 218 Discussion on analogical resemblances, enlarged and modified. 516 232 | Homological structure of the feet of certain marsupial animals. 518 236 ||On serial homologies, corrected. 520 237 |Mr. E. Ray Lankester on morphology. 521 240 ||On the asexual reproduction of Chironomus. 541 262 ||On the origin of rudimentary parts, corrected. - 547 ‘262 I'" on the sterility of hybrids, corrected. 552 275 | Recapitulation on the absence of fossils beneath the Cambrian system, corrected. 568 293 | Natural selection not the exclusive agency in the modification of species, as always maintained in this work. 572 297 |The belief in the separate creation of species gen

erally 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.”

WHEwBLL : Bridgewater Treatise.

“The only distinct meaning of the word “natural’ is stated, Jired, 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 proficience in both.” BACON: Advancement of Learning.

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I will here give a brief sketch of the progress of opinion on the Origin of Species. Until recently the great majority of naturalists believed that species were immutable productions, and had been separately created. This view has been ably maintained by many authors. Some few naturalists, on the other hand, have believed that species undergo modification, and that the existing forms of life are the descendants by true generation of pre-existing forms. Passing over allusions to the subject in the classical writers,” the first author who in

* Aristotle, in his “Physicae Auscultationes’ (lib. 2, cap. 8, s. 2), after remarking that rain does not fall in order to make the corn grow, any more than it falls to spoil the farmer's corn when threshed out of doors, applies the same argument to organisation; and adds (as translated by Mr. Clair Grece, who first pointed out the passage to me), “So what hinders the different parts [of the # from having this merely accidental relation in nature? as the teeth, for example, grow by necessity, the front ones sharp, adapted for dividing, and the grinders flat, and serviceable for masticating the food; since they were not made for the sake of this, but it was the result of accident. And in like manner as to the other parts in which there appears to exist an adaptation to an end. Wheresoever, therefore, all things together (that is all the parts of one whole) happened like as if they were made for the sake of something, these were preserved, having been appropriately constituted

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