T 



Notices respecting New Boohs. 423 



It will be seen from the Table that Nos. 112 and 113 never 

 differ by more than one part in ten thousand at the same 

 temperature. 



Physical Laboratory, 

 University of Michigan. 



L. Notices respecting New Books. 

 Watts s Dictionary of Chemistry. 



Watts' s Dictionary of Chemistry, revised and entirely rewritten. 



By M. M. Pattiso^ Muir, M.A., andK. Foster Morley, M.A. 



D.Sc. Vol. II. Longmans, Green, and Co. 



HE second instalment of this invaluable work maintains the high 

 character of the preceding volume. Commencing with Cheno- 

 cholic Acid, the work concludes with an article on Indigo which ter- 

 minates on page 700. The list of contributors contains the names 

 of some authors who contributed to the first volume together with 

 several new writers ; the list is a sufficient guarantee that the editors 

 have secured the collaboration of some of the highest authorities 

 on the special subjects treated of. Among the longer articles are 

 those by Dr. Schuuck on Chlorophyll, by Dr. McGowan on Cho- 

 lesteriue, on Chromium by Mr. Muir, and on Cinchona bark by 

 Mr. David Howard. The article on Chemical Classification by 

 Mr. Muir occupies over 20 pages and is followed by a very useful 

 bibliographical list. The same author contributes the articles on 

 Cobalt and its compounds, on the Laws of Chemical Combination, and 

 on the Combining Weights of the elements. The article on Com- 

 bustion by Prof. Thorpe might with advantage have been extended ; 

 in its present form it is entirely historical. About 9 pages are 

 devoted to the subject of Crystallization, the writer being Mr. H. 

 Baker, and a long article (about 24 pages) on Cyanic Acids is 

 from the pen of Dr. Senier. Mr. Muir devotes over two dozen 

 pages to the Cyanides, and a short article on Relative Densities is 

 contributed by Miss Ida Ereund. An excellent article by Prof. 

 Threlfall on Dissociation, which extends to 28 pages, must be noted 

 as one of the special features of the present volume, and an equally 

 valuable article on Chemical Equilibrium is from the pen of Prof. 

 J. J. Thomson. The article on Equivalency is written by Prof. 

 Ira Bemsen, and that on Explosion is by Prof. Threlfall. Dr. S. 

 Eideal contributes a somewhat sketchy article on Fermentation 

 and Putrefaction, and the bibliographical list of works relating to 

 this subject is not quite as extensive as could have been wished. 

 Prof. Thorpe writes on Elame, Mr. Veley on Formic Acid, and Prof. 

 Ira E-emsen on Formulae. The article on Geological Chemistry is 

 by Mr. F. W. Eudler, and is sufficiently excellent to make us regret 

 that more space could not have been devoted to this important and 

 little studied branch of the science. Prof. Japp contributes the 

 article on the Hydrazines and Hydrazones. A long article on 



