ession on the reader's mind
if we permitted him to suppose that the value of that work depends
wholly on the ultimate justification of the theoretical views which it
contains. On the contrary, if they were disproved to-morrow, the book
would still be the best of its kind--the most compendious statement of
well-sifted facts bearing on the doctrine of species that has ever
appeared. The chapters on Variation, on the Struggle for Existence, on
Instinct, on Hybridism, on the Imperfection of the Geological Record, on
Geographical Distribution, have not only no equals, but, so far as our
knowledge goes, no competitors, within the range of biological
literature. And viewed as a whole, we do not believe that, since the
publication of Von Baer's Researches on Development, thirty years ago,
any work has appeared calculated to exert so large an influence, not
only on the future of Biology, but in extending the domination of
Science over regions of thought into which she has, as yet, hardly
penetrated.

FOOTNOTES:

[61] On the Osteology of the Chimpanzees and Orangs: Transactions of the
Zoological Society, 1858.

[62] Colonel Humphreys' statements are exceedingly explicit on this
point:--"When an Ancon ewe is impregnated by a common ram, the increase
resembles wholly either the ewe or the ram. The increase of the common
ewe impregnated by an Ancon ram follows entirely the one or the other,
without blending any of the distinguishing and essential peculiarities
of both. Frequent instances have happened where common ewes have had
twins by Ancon rams, when one exhibited the complete marks and features
of the ewe, the other of the ram. The contrast has been rendered
singularly striking, when one short-legged and one long-legged lamb,
produced at a birth, have been seen sucking the dam at the same
time."--_Philosophical Transactions_, 1813, Pt. I., pp. 89, 90.

[63] Recent investigations tend to show that this statement is not
strictly accurate.--1870.

[64] See Phil. Zoologique, vol. i. p. 222, et seq.

XIII.

CRITICISMS ON "THE ORIGIN OF SPECIES."

1. UEBER DIE DARWIN'SCHE SCHOePFUNGSTHEORIE; EIN VORTAG, VON A.
KOeLLIKER. Leipzig, 1864.

2. EXAMINATION DU LIVRE DE M. DARWIN SUR L'ORIGINE DES ESPECES.
PAR P. FLOURENS. Paris, 1864.

In the course of the present year [1864] several foreign commentaries
upon Mr. Darwin's great work have made their appearance. Those who have
perused that remarkable