Chemistry and Physics. 461 



8. Physikalisch-chemische Propadeutik ; von H. Griesbach, 

 zweite Halfte, 3 Lieferung, Band I, pp. 945-992 and Band II, pp. 

 1-352. Leipsic, 1900 (Wilhelm Engelmann). The first two install- 

 ments of this work were noticed in this Journal, December, 1896. 

 The present, fourth installment gives a most favorable impres- 

 sion of the author's success in continuing the excellence of his 

 work. The size of the book as well as its scope have been en- 

 larged beyond the original intention, so that a second volume is 

 now begun. In giving a general view of modern scientific knowl- 

 edge the work will be valuable to many classes of readers. 



h. l. w. 



9. A School Chemistry ; by John Waddell. 12mo, pp. 

 xiii, 278. .New York, 1900 (The Macmillan Company).— This 

 text-book on elementary chemistry possesses many excellent fea- 

 tures. The author has shown much originality in his presentation 

 of the subject, good judgment in regard to the scope of the book, 

 and accuracy in his statements of facts and theories. The inter- 

 rogatory method is largely employed with the object of stimulat- 

 ing the pupil's thought. It is the aim of the book to help the 

 student in the discovery of facts, to enable him to see their 

 connections, and to show how facts lead to theory. h. l. w. 



10. Lemons de Chimie Physique ; by J. H. van't Hopf. Vol- 

 ume III. Relations between the properties and the composition. 

 Translated from the German edition by M. Corvisy. 8vo, pp. 170, 

 Paris, 1900 (A. Hermann). — This book is a very literal translation 

 of the concluding volume of van't Hoff's " Vorlesungen iiber 

 Chemie " which appeared early in the year. The subject treated is, 

 however, practically independent of the two earlier volumes. The 

 relations between the physical properties and the composition are 

 first taken up. Under this heading, come the relations and behav- 

 ior of matter in regard to space, pressure, temperature, heat, sur- 

 face tension and optical properties. The second half oi the book 

 treats of the relations between the chemical properties and the 

 composition. 



Van't Hoff has made a wide departure from other books on 

 physical chemistry which have thus far appeared. He aims not 

 to treat the subject exhaustively but to take up the more 

 important or more interesting parts, and these are treated in his 

 usual brilliant manner. h. w. p. 



11. On the Viscosity of Gases as affected by Temperature / by 

 Lord Rayleigh. — A former paper* describes the apparatus by 

 which I examined the influence of temperature upon the viscosity 

 of argon and other gases. I have recently had the opportunity 

 of testing, in the same way, an interesting sample of gas prepared 

 by Professor Dewar, being the residue, uncondensed by liquid 

 hydrogen, from a large quantity collected at the Bath springs. 

 As was to be expected, it consists mainly of helium, as is evi- 

 denced by its spectrum when rendered luminous in a vacuum 

 tube. A line, not visible from another helium tube, approxi- 

 mately in the position of D 6 (Neon) is also apparent. The result 



* This Journal, ix, 365. 



