1872.] Notices of Books. 377 
classification still being based essentially upon the views put 
forth by Professor Huxley. Every care has been taken to render 
the work self-explanatory. An admirable glossary is appended ; 
the book being, indeed, the best hand-book on the subject. 
Introduction to the Study of Biology. By H. ALLEYNE 
NicHorson, M.D:, D:Sc., M-A., Ph.D.; F.R:S.E.,-F.G.S., 
&c., Professor of Natural History and Botany in University 
College, Toronto. Edinburgh and London: William Black- 
wood and Sons. 1872. 
Tuis little work is something more than a school-book. It is 
based chiefly upon the Introduction to Dr. Nicholson’s ‘‘ Manual 
of Zoology.” We commend it for the concise description of 
the several biological theories, their errors and agreements. 
The book is well enough bound to form a useful and a 
handsome present. 
The Earth’s Crust. A Handy Outline of Geology. By Davin 
Pace, LL.D., F.G.S., Professor of Geology in the College 
of Physical Science, Newcastle-on-Tyne— University of 
Durham. Sixth Edition. Edinburgh and London: William 
Blackwood and Sons. 1872. 
Tus is another edition of Dr. Page’s Outline-sketch of Geology, 
now sometime out of print. It forms one of Messrs. Black- 
wood’s Natural Science Series; and is admirably suited to the 
student attending elementary lectures on geology. 
Science Primers. 1. Chemistry. By H. E. Roscoe, Professor 
of Chemistry in Owen’s College, Manchester; Author of 
“The Spectrum Analysis,” ‘* Lessons in Elementary 
Chemistry,” &c. III. Physics. By BatFrour STEwart, 
Professor of Natural Philosophy, Owen’s College, Man- 
chester; Author of ‘‘ Elementary Lessons in Physics.” 
London and New York: Macmillan and Co. 1872. 
In publishing these elementary works on Chemistry and Physics, 
“the object of the authors has been to state the fundamental 
principles of their respective sciences in a manner suited to 
pupils of an early age.” Notwithstanding the difficulty of 
describing in simple language experiments really scientific in 
their nature, we need scarcely say Professors Roscoe and Stewart 
have been eminently successful. They have accomplished their 
object in a manner new to elementary treatises, that of teaching 
by direct experiment. Nothing is advanced in either of these 
little works that is not proved by a simple experiment. It ought 
WOL. I1.. (N-S.) 20€ 
