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say, we do not understand any better having read it than we did before we 
had opened its pages. It seems to us that the author sadly requires a study 
of the more important works on chemistry ; for we think that, if he perused 
any of them carefully, he would recognise the fact that heat is not the un- 
recognised agency he imagines it to be, either in chemistry or physics. We 
are perfectly certain that a careful perusal of Dr. Tyndall’s admirable volume 
would satisfy him that he has, with a considerable degree of afiectation, 
been talking a very large amount of nonsense. We generally find that men 
who desire to express their opinions in language which is entirely of their 
own choice most frequently expend the largest share of their brain-power 
upon the dictionary faculty which they possess. 
SHOUT NOTICES. 
Table of Classification of the Animal Kingdom. By Professor J. Rsay 
Greene, M.D., of the Queen’s University in Ireland. London : Churchill. 
1872. Here we have three tabular arrangements of the animal kingdom, 
intended to be hung on the walls of schools and lecture-rooms, and which 
measure over five feet in length and about a yard in breadth. They give 
the entire animal kingdom, divided into its several branches, including many 
sections which are below the Orders in point of rank. F urther, in the upper 
part of the third chart, is given a classification of the entire animal kingdom, 
showing, in so far as modern research will go, the relationship of descent of 
the several divisions, whose allies have been as yet made out. Altogether, it is 
not too much to say that these sheets are unquestionably the best of their 
kind, but we may further say they are so far advanced beyond the ideas of 
many lecturers in zoology, that we fancy these will not purchase them from 
the fear of their involving a new course of lectures. However, such 
will be unconscientious men. For it is unquestionable that Professor 
Greene has not simply followed some individual zoologist, but has endea- 
voured to take the best from all European authorities. We only regret that 
he has not printed the extinct orders in a different type from the living ones. 
The Travelling Birds, by Cuthbert Collingwood, M.A., F.L.S. London : 
Bean, 1872. The author has adopted the Marcetian principle in this volume, 
and so we have a prolonged conversation between Harrj?, Amy, and the various 
birds as to their habits of migration. The facts are generally true, but in 
our opinion the style is abominable. 
Strength of Materials and Structures, by John Anderson, C.E., LL.D. 
London : Longmans, 1872. This is another of that excellent series of books 
for the masses which are being issued by Messrs. Longmans. The first part 
deals with the strength of materials as depending on their quality and as 
ascertained by testing apparatus. The second treats of the strength of 
structures, as depending on the form and arrangement of their parts and on 
the materials of which they are constructed. The author refers to many 
axperiments, almost all of which have been made at Woolwich with the 
American testing-machine, and shows very clearly how the strength of rope 
