92 
POPULAR SCIENCE REVIEW. 
an illustration. In this he introduces us in about a page and a half to one 
of the foreign instruments, and he absolutely dismisses the subject "without 
any allusion to the two lenses of the eye-piece, or even in the most rudi- 
mentary shape or form to errors of chromatic or spherical abberration, or to 
the fact that there is such a condition as that of immersion in object-glasses. 
His observations on the subject of the spectroscope are wrapped in the 
same Cimmerian darkness. And his idea that the spectroscope may 
u render important service to physiology and forensic medicine,” by the 
fact that poisoning by hydrocyanic acid may be immediately recognised by 
it, is of course absurd, because the blood would never be examined until 
all trace of the poison had passed away. We have no doubt that the 
author is a thoroughly competent authority, but we are equally certain 
that he is not a populariser of science, and we therefore regret that he has 
been employed by Messrs. King, to some of whose books of this series we 
have given the very highest praise. We shall be much surprised indeed if it 
ever achieves popularity among our English readers. 
fancy that we spoke well of this book when it appeared in its first 
edition. If so our praise was given where it was due, as the passage 
of the work through a second issue pretty conclusively demonstrates. It is 
a book well and clearly written and very well illustrated — more than 150 
woodcuts— and the author has very properly placed the name of the writer 
from whose works he has taken the illustrations after all woodcuts, except 
those which have been in service for the past thirty years. Thus we 
notice cuts from Huxley, Forbes, Johnston, Gosse, Hincks, Ehrenberg, 
Schmidt, Muller, Carpenter, Carter, Beale, Gunther, Diimeril, Van der 
Hceven, Woodward and others, showing that he has been careful to select 
from good authorities ; and the matter of the book is fairly compiled and 
many additions have been made to the Vertebrata, so that we can congratu- 
late the author on the success of his book, which of course is an elemen- 
rpHIS is a book to which is hardly due a place in this Review, for it 
JL really is a medical work. Still, it treats upon a subject of which 
the author is the first scientific exponent in this country, and therefore it 
* “An Introductory Text-book of Zoology for the use of Junior Classes.” 
By H. Alleyne Nicholson, M.D., D.S.C., M.A., Professor of Natural History in 
the University of St. Andrews. 2nd edition. Blackwood and Sons : Edin- 
burgh, 1875. 
t “ Tape'- worms. Their Sources, Varieties, and Treatment ; with one 
hundred cases.” ‘ By T. Spencer Cobbold, M.D., F.R.S. 3rd edition. Lon- 
don : Longmans. 1875. 
ZOOLOGY FOR JUNIORS.* 
tary one. 
TAPE-WORMS.f 
