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POPULAR SCIENCE REVIEW. 
Dr. Smith’s remarks are judiciously cautious, hut they are to the point; 
and the multitude of analyses hy which they are accompanied hear them 
fully out. Altogether, we are well pleased with the hook, which, with a 
few deficiencies in style, is an admirable essay on a very difficult question. 
MILLER’S CHEMISTRY: PHYSICS.* 
T HE fifth edition of Part II. of this excellent treatise on Chemistry is 
now before us, and we may just say a word or two about it. We 
remember well enough the appearance of the first edition of this work 
when we were at college some fifteen years ago. It was an excellent 
introduction to chemical physics — clear and intelligible to the lowest 
intellect, amply illustrated, and printed in a large and bold type. In what, 
then, does the present work dilfer from the first one ? Well, it is nearly 
twice the size, contains a bulk of matter which renders it a terrible book to 
the readers of the first edition, and the matter is excellently arranged, and 
is all that the mere student of chemistry can require ; indeed, it is much 
more than an ordinary chemical student requires. Still, there are some 
parts which ought to have additions made to them, and some which, in our 
opinion, might as well have been cut out. But, doubtless, that was out of 
the question in editing a work like the present one. Mr. McLeod has, we 
think, performed his task with extreme caution and excellent good taste ; 
and he has introduced a quantity of matter in relation to spectrum analysis, 
and to the question which has lately occupied the Chemical Society — that 
of atomicity ; thus bringing the book up to the time, so that it forms an 
excellent manual of physics for the chemical student. 
GEOLOGICAL SURVEY OF OHIO.t 
D URING the time occupied by the geological survey of the State, the 
Chief Geologist is required to make an annual report of the progress 
of the survey, with such necessary illustrations as may exemplify the same ; 
and the present volume is the result of the field and other work for 1870. 
The determination of the geological structure of Ohio was not only im- 
portant as bearing on the character, variety, and distribution of the mineral 
riches of the district, but also as showing the connection of the geological 
features of the country lying between the Atlantic and Mississipi. Already 
the number of formations known to exist in the State has been nearly 
* 11 Elements of Chemistry, Theoretical and Practical.” By William 
Allen Miller, M.D., D.C.L., late Professor of Chemistry in King’s College, 
London. Revised by H. McLeod, F.C.S. Part II. Chemical Physics. 
5th edition. London : Longmans, 1872. 
t “ Geological Survey of Ohio : Report of Progress in 1870.” By J. S. 
Newberry, Chief Geologist, and Assistants. 8vo., pp. 578, with maps and 
sections. Columbus, 1871. 
