REVIEWS. 
179 
hence the geologist has found it necessary to modify to some slight extent cer- 
tain of his former views. With these exceptions, the present work is the 
same as the edition produced in 1867. But the reader who has not got the tenth 
edition will find that this one contains a host of facts and arguments, which 
do not make any appearance in the earlier issues of this splendid treatise. 
Among the more important matters peculiar to this edition is Chapter xx., 
in which the author discusses Dr. Carpenter’s opinions on the subject of 
ocean-temperature. In regard to this point Sir Charles and Dr. Carpenter 
are at issue respecting the currents of the Mediterranean. The latter af- 
firmed (we do not know that he still affirms) that there is a constant cur- 
rent flowing at the depth of 250 fathoms out of the Mediterranean. This is 
denied by Sir Charles Lyell, who calls in the subsequent researches of 
Captain Nares, which seem to prove the correctness of his formerly expressed 
opinions. In regard to Dr. Carpenter’s researches in the North Atlantic, 
Sir Charles is entirely with him in the opinion that there are two cur- 
rents, an upper warm one going towards the pole, and an imder cold one 
below 32° Fahrenheit travelling towards the equator. There are many 
other points of novelty in the volume which Sir Charles Lyell has just 
issued which we cannot touch upon, but we may conclude with a hearty- 
expression of the delight with which we have read the most charming 
treatise in existence upon general geology. 
DAK WIN’S “ ORIGIN OF SPECIES.” * 
I F we had only time and space to give a proper notice of Mr. Darwin’s 
great work,]we should do so with feelings of the most intense pleasure. 
For, even though this is the sixth edition, it is nevertheless a new book ; 
inasmuch as the author has taken up the arguments of his several oppo- 
nents, and, we] may fairly say, has reduced them to little more than mis- 
interpretations ; and, on the other hand, he has given a mass of new matter 
which goes less^or more to bear out his views of natural selection being 
the cause which has produced the present variation in animals from some 
four or five types. We have not seen the edition which precedes this, so 
we are not certain whether its type differs from that of the first one, but at 
all events we may mention that, in its present form, it is in a much smaller 
and less agreeable type than formerly. In making this alteration, the 
author, we think, was led into a mistake. We shall just cite the more 
important additions which the present volume possesses. It has taken up, 
for example, Mr. Mivart’s chief objections, and, so far as we have seen, has 
answered them satisfactorily. Next it deals with Mr. Ray Lankester’s most 
philosophic essay on morphology. Reasons are given for disbelieving in 
great and sudden modifications. The author confirms his statement upon 
the habits ofj the young cuckoo. He has the discussion on analogical 
* a The Origin of Species by means of Natural Selection ; or the Preser- 
vation of Favoured Races in the Struggle for Life.” By Charles Darwin, 
M.A., F.R.S. 6th edition. London : John Murray, 1872. 
