Chemistry and Physics. 425 



amounting to 7-£ per cent with the minimum of air, disappear- 

 ing as the air supply increases; (5) that small but variable quan- 

 tities of nitrogen oxides are present. In the inner cone therefore 

 carbon monoxide is the main product, and in the outer one carbon 

 dioxide. — J. Chem. Soc, lxv, 603-610, July, 1894. g. f. b. 



6. Select Methods in Chemical Analysis • by William Crookes, 

 Third Edition (Longmans, Green, & Co.) — The new edition of 

 this well-known work, though no more bulky than' its immediate 

 predecessor, includes the description of many new processes of 

 analysis in place of methods which have been superseded or 

 which have become so widely known that they need no mention 

 in a work which aims merely to bring together novelties. Pro- 

 cesses of technical importance only, such, for example as methods 

 of furnace assaying or processes of analysis of iron, steel, and 

 ores of iron, have been displaced because such topics are now 

 fully treated elsewhere. The chief additions have been in the 

 line of electrolytic analysis. Only such methods as have been 

 put to the test in the author's own laboratory are admitted, and 

 it is of course to be expected that many developments of the nine 

 years intervening since the issue of the second edition find no 

 mention. This edition will no doubt be as welcome to practical 

 chemists as was each of the preceding issues in its time. 



F. A. G. 



7. An Elementary Manual of Chemistry ; by F. H. Stores, 

 Professor of Agi-icultural Chemistry in Harvard University, and 

 W. B. Lindsay, Professor of General and Analytical Chemistry 

 in Dickinson College. Being a Revision and Rewriting of Prof'. 

 W. R. Nichol's Abridgment of Eliot and Storer's Manual. 

 New York, Cincinnati and Chicago: American Book Company, 

 pp. 453. — The rapidly increasing rate of progress of the experi- 

 mental sciences renders necessary frequent issue of newly posted 

 text-books, and among the many serviceable handbooks of chem- 

 istry, none is likely to be found superior to this " lineal descend- 

 ant " of Eliot and Storer's Manual whose appearance nearly 

 thirty years since first rendered systematic laboratory instruction 

 to large classes in general chemistry practicable and pleasant 

 both to student and teacher. The original Manual was rather 

 bulky for the most advantageous use. In Nichol's abridgment 

 we thought much of the excellence of the Manual was sacrificed 

 and are glad to find in this less condensed revision and rewriting 

 the touch of master hands evident throughout. 



The book is equally valuable in the class room and the labora- 

 tory. The instructor will find in it the essentials of chemical 

 science developed in easy and appropriate sequence, its facts and 

 generalizations expressed accurately and fully but concisely as 

 well as forcibly and elegantly. A large number of those funda- 

 mental or important facts of chemistry that are inaccessible 

 through ordinary experience are demonstrated in 258 experiments 

 mostly so simple and so well described and illustrated (by 125 

 engravings) that any intelligent youth provided with the cheap 



