REVIEW 
A Handbook | of | Colloid-Chemistry j The recognition of colloids, the | 
theory of colloids, and their | general physico-chemi- | cal properties 
| by | Dr. Wolfgang Ostwald | Privatdozent in the University of 
Leipzig | second English edition | translated from the third German 
edition | by | Dr. Martin H. Fischer | professor of physiology in the 
University of Cincinnati | with numerous notes added | by | Emil 
Hatschek | Cass Institute, London | with 63 illustrations | Phila- 
delphia | P. Blakiston’s Son & Co. | 1012 Walnut Street. Cloth, 
pp. i-xvi + 1-284, $3.50 net. 
Due principally to the rapidly increasing realization of the 
importance of colloid chemistry in various fields, especially 
in the practical applications of chemical science, the scarcity of 
textbooks on this subject has been felt. This new English edi- 
tion of Wolfgang Ostwald’s standard work will undoubtedly 
meet a ready reception. While not so much as might be wished 
has been added since 1912 (a thorough revision being impos- 
sible on account of the war), the results of some recent work, 
particularly of Hatschek’s own researches on the physical prop- 
erties of colloids, have been included. 
A brief introduction includes the methods for recognition of 
colloids, their classification into suspensions and emulsoids, and 
the determination of their electric charge. Part I is a presenta- 
tion of the theory of colloids, and includes chapters on their 
constitution, general properties, and energy relations. The 
present conception of colloid chemistry as a science dealing with 
surface-energy relations of a condition (the colloid state) which 
is very common, and in which any substance may be, is con- 
trasted with the original view that the subject dealt only with 
a few glue-like substances. Part II takes up in detail the phys- 
ical properties of colloids, such as vapor tension, viscosity, 
Brownian movement, and diffusibility. 
The book is well suited for a text or a reference book for 
those whose work is related to the subject of colloids. 
G. A. P. 
167853 6 491 
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