Chemistry.and Physies. 419 
thus set free is then determined by a standard solution of hyposul- 
phite of sodium which bleaches the solution colored by the iodine. 
The solution of the hyposulphite is standardized by a et 
Saba with pure Mn,O,.—Ann. Chim. et de P, 7 ae 
ae aR, 
19, Light: A series of simple, longed ie abit 
experiments in the phenomena of light, for the use of students of 
every age; by Atrrep M. Mayer and. Cavacus BaRNnarp. 112 
. 8v0. New Yo rk, 1877, (D. Appleton & Co.).—The purpose of 
this little volume is to present an tnstrate the fundamental phe- 
nomena of light in a manner suited to the ready comprehension 
of the younger class ‘of students, and to suggest means for verify- 
ing the laws of its action by actual experiment. The text, which 
was prepared by Mr. Barnard and revised by Professor Mayer, is 
written in vivacious and entertaining style, and with such clear- 
use of the m ost common oe materials, and at a very 
than fie seer dol s. The aim of t the dutho ors has ng to make 
4 7. E. THORPE, Pb.D., F.R.S., Paskeaace of Chemistry in the 
herinerse College of Science, Leeds. New edition, 406 
New York, 1877, (G. P. Putnam & Sons).—The — ious edition 
of this work, as well as the other volumes by the same author. 
well known among chemists, and their value fally apprectinel 
‘A feature of this new edition is the co —_ of examination q 
tions and exercises at the end of the wei 
21. A System of Volumetric Analysis, by Dr. Emil thesenent 
Translated with notes and additions from the second Germ 
edition; by M. M. Parrison Murr, F.R.S.E. 274 pp. 8vo. Lite 
don, 1877, (Macmillan & — erit of this work 
lies in the fact that it gives not “a complete collection of receipt 
for indepen system of gene thods under 
hich the individual cases may be bro remar kes 3 ior 
ugh s 
translator the work LF to divide volumetri 
a few great groups, to explain clearly the principles inde ance fay 
each, and farther to illustrate by examples the application of these 
principles. It will be readily seen how much greater benefit the 
