524 Scientific Intelligence. 



of the contents of these three chapters to a treatise on spectroscopy, 

 but we think that his final decision to include these subjects in his 

 book was a happy conclusion since there is no other published list 

 which approaches the present one either in completeness or in 

 scientific critique. 



The fourth chapter practically exhaust' the subject of disper- 

 sion, both from the theoretical and from the experimental points of 

 view. It comes from the pen of Pfltiger, who is a recognized 

 authority on the questions involved. This chapter is also unique 

 in completeness and elegance of presentation. It will be as wel- 

 come to the theoretical physicist as to the specialist in spectro- 

 scopy. The fifth and sixth chapters were written, in the order 

 named, by Kayser and by Konen, and they are devoted respec- 

 tively to phosphorescence and fluorescence. No other accounts of 

 these subjects are at all comparable with the exposition of these 

 two chapters. In this sense, the last two chapters are as new as 

 the preceding ones. 



The four volumes, thus far published, constitute a masterpiece 

 of scientific literature. The fourth volume ranks with the second 

 in promise of stimulating interest in research in its special fields. 

 Other volumes are to follow until the whole subject of spectro- 

 scopy will have been critically discussed and its literature brought 

 down to the dates of publication of the several volumes. 



h. s. u. 



8. Refrigeration : an Elementary Text-book; by J. Wemyss 

 Anderson. Pp. ix-f 242. New York and London, 1908 (Long- 

 mans, Green & Co.). — The first seventy-eight pages of this book 

 are devoted to an introduction to the theory of heat and the 

 thermal properties of gases, liquids and vapors. The simplest 

 element of thermodynamics are given, Carnot's engine is described, 

 and the doctrine of the efficiency of refrigerators is based upon 

 its reversed action. The remainder of the work describes a num- 

 ber of forms of refrigeratory machineiy and deals with various 

 practical problems which arise in connection with them. Ice- 

 making, and the design and insulation of cold-stores are con- 

 sidered, and much uselul information is given in the form of 

 tables. h. a. b. 



9. Introduction to Metallography y by Paul Goerens. Trans- 

 lated b}^ Fred Ibbotsox. Pp. x, 214. New York and London, 

 1908 (Longmans, Green & Co.). — The first of the four parts into 

 which this work is divided deals with allotropy and the experi- 

 mental determination of transformation points by the method of 

 curves of cooling. The more important forms of pyrometers are 

 described (including recording instruments) and brief directions 

 are given for their use. The second part begins with an admir- 

 ably simple and interesting introduction to those parts of the 

 theory of solutions which have recently been applied with so 

 much success to the study of alloys. Gibbs's phase-rule is 

 explained and its applications by Roozeboom and others. Curves 

 are given for a large number of binary and ternary alloys, their 



