I 37 
x88o.] Analyses of Books. 
said, that all students will welcome the work of Professors 
Roscoe and Schorlemmer as a masterly treatise on the newest 
discoveries and the most recent methods of modern chemistry. 
This concluding volume contains lucid descriptions of the 
metals oi the iron, chromium, tin, antimony, and gold groups. 
Three supplementary chapters are devoted to spedlrum analysis, 
a subject in which Prof. Roscoe is one of the foremost and 
most successful workers, — the natural arrangement of the ele- 
ments and the periodic law of Mendeleef, and an account of the 
processes employed by MM. Pidtet and Cailletet for the lique- 
faction of hydrogen, oxygen, and other gases which have hitherto 
been considered permanent. No pains have been spared to per- 
fect the descriptions of the various technical processes, by the 
aid of beautifully executed engravings. There are, in our 
opinion, several inaccuracies in the nomenclature, and of course 
a few clerical errors ; but the work has, notwithstanding these, 
been most carefully prepared, and will take a high position as a 
standard chemical treatise. 
A Manual of Paleontology for the Use of Students. With a 
General Introduction on the Principles of Palaeontology. 
By H. Alleyne Nicholson, M.D., D.Sc., &c. Second 
Edition, revised and greatly enlarged. Edinburgh and 
London : W. Blackwood and Sons. 
We have great pleasure in welcoming a second edition, revised 
and enlarged, of Dr. Nicholson’s excellent Manual. All the more 
important discoveries made from 1872 down to near the end of 
1878 have been incorporated in the work ; the sedtion on Strati- 
graphical Palaeontology has been entirely omitted, as requiring 
to be dealt with separately ; and the nnmber of illustrations has 
been greatly increased. The features remaining unchanged are 
the spirit of accuracy and thoroughness, and the sound judgment 
which pervade all of Dr. Nicholson’s writings. We can hence 
recommend him to the student as a safe guide, who, whilst always 
willing and ready to theorise upon a well-ascertained basis, never 
gives too free rein to the imagination, or seeks to be wise beyond 
what is demonstrated. In an age given to rash speculations 
such a teacher is invaluable. 
The remarks on the conclusions to be drawn from fossils 
should be read and re-read by the young geologist. It is exceed- 
ingly important that so highly-disciplined and judicious a thinker 
as Dr. Nicholson considers that the existence of man may be 
traced back to the Post-pliocene, possibly even to the Miocene, 
Age. 
VOL. II. (third series). 
L 
