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POPULAR SCIENCE REVIEW. 
observations of his own, and a limited knowledge of the literature of his 
subject, has ventured to discuss the question as to whether the interior of 
the earth is a mass of liquid fire. The book is not badly written, it is 
remarkably well printed, and its mechanical features are generally good. 
But in other respects it is a volume which, though it may gratify the amour- 
propre of the author, can serve no useful purpose either to science or theology. 
Mr. Malet seeks to show that the interior of the earth is not fire, and that 
the present shape of the globe is due chiefly to the influence of water in 
some form or other. His text is, 11 The Spirit of God moved upon the face 
of the Waters,” and, starting with this, he displays much of the ingenuity of 
a special pleader in urging his cause. As a whole, however, the work 
deserves no further notice at our hands. 
A MANUAL OF ZOOLOGY.* 
H AS not Dr. Nicholson infringed Mr. Renshaw’s copyright in giving his 
book the same title as that of the English edition of M. Milne Edwards’ 
well-known handbook ? The question is one of importance, though it does 
not affect the reviewer. Of the authors labours in producing this work we 
•cannot speak in very favourable terms. The book is too diffuse in some parts, 
and too concise in others. Yet is it a work which in point of accuracy far sur- 
passes most of the Manuals which of late years have issued from the press. 
It is devoted exclusively to the subject of the Invertebrates, and, so far as 
we can see, it consists very nearly entirely of a paraphrasis of Huxley’s 
recent volume, and the two admirable little manuals of Professor J. Reay 
Greene. This, it seems to us, is hardly fair. When Mr. Greene wrote his 
Manuals, he had all the labour of going to the actual fountain-heads for 
information, and as a consequence he produced a work which for exacti- 
tude and condensation stands facile princeps. But practically, this Manual of 
Dr. Nicholson’s is the three volumes we have referred to rolled — like the pro- 
verbial single gentleman — into one. The illustrations are not at all numerous 
enough, and they are barbarously printed. We believe that, though Mr. 
Ilardwicke’s name is on the title-page, he has ceased to be the publisher of 
the work. 
GRAVE-MOUNDS AND THEIR CONTENTS.! 
O NE would hardly have thought that so limited a branch of archaeology 
as that of grave-mounds could have been made the subject of a volume 
of three hundred pages, and yet the book before us deals almost exclusively 
with the history of these objects, and is by no means a made-up work, but 
• u A Manual of Zoology, for the Use of Students, with a general Intro- 
duction on the Principles of Zoology.” By Henry Alleyne Nicholson, M.D., 
D.Sc. Vol. i.. Invertebrate Animals. London : Ilardwicke, 1870. 
t “ Grave-Mounds and their Contents : a Manual of Archceology as 
exemplified in the Burials of the Celtic, Itomano-British, and Anglo-Saxon 
Periods.” By Llewellyn Jewitt, F.S.A. London : Groombridge, 1870. 
