502 Notices of Books. (October, 
useful information on magnetism and the deviation of the com- 
pass. The want at present felt by students, on account of the 
alteration in the examinations conducted by the Board of Trade, 
is well supplied in this manual, which will prove of great benefit 
to those preparing for a nautical life. 
As Regards Protoplasm. By James HutcuHinson SrTirR.Lina, 
F.R.C.S., and LL.D., Edin. New and Improved Edition. 
London: Longmans and Co. 1872. 
In the present edition of Dr. Stirling’s controversial pamphlet 
there is appended a second part, in reference to Prof. Huxley’s 
second issue, and a preface in reply to Prof. Huxley’s ‘“ Yeast.” 
The subject-matter is too well known to the public to need again 
noticing in this place: we may say that the additions are too 
personal to be either quoted or condensed with advantage. The 
pamphlet should be read in its present form. 
Patterns for Turning: Comprising Elliptical and other Figures 
Cut on the Lathe without the Use of any Ornamental 
Chuck. By H. W. EvLpuinstone. With Seventy Illustra- 
tions. London: John Murray. 1872. 
Mr. ELPHINSTONE, in this elaborately illustrated work, provides 
directions for the cutting of elliptical and other figures, on a 
lathe furnished with a division-plate, an ornamental slide-rest, 
and eccentric cutting-frame, and an overhead motion. The book 
is intended for perusal on the bench, and is admirably arranged 
for the use of the practicat mechanic. The formule are exceed- 
ingly simple, and require but a very elementary knowledge of 
mathematics. Every amateur turner should obtain a copy of 
Mr. Elphinstone’s work. 
A Handbook of Chemical Technology. By RupoLpH WAGNER, 
Ph.D., Professor of Chemical Technology at the University 
of Wurtzburg. ‘Translated and Edited from the Eighth 
German Edition, with Extensive Additions, by WILLIAM 
Crookes, F.R.S. With 336 Illustrations. London: J. and 
AG Churchill, 1872. 
WE present to our readers a notice of this work, although criti- 
cism is of course not within our province. We give a synopsis 
of the contents, in the hope that our readers will find a practical 
answer to many technical questions of daily occurrence. Under 
the head of Metallurgical Chemistry the latest methods of pre- 
paring iron, cobalt, nickel, copper, copper salts, lead and tin 
and their salts, bismuth, zinc, zinc salts, cadmium, antimony, 
