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BOOK R~v,Ews.
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BOOK REVIEWS.
CHEMICAL ENGINEERING CATALOG. Twelfth annual edition, II6o pages, illustrated, quarto. New York, The Chemical Catalog Company, Inc., I927.
Prices adjusted to special conditions as indicated in the volume. This publication has been noticed as it appeared in the issues of the JOURNAL and it is necessary here only to record that the present edition maintains the character of the work as established in its earlier publications and constitutes a very valuable summary of the chemical engineering manufacturing in this country. The classified directory has been further enlarged and contains the listings of more than 2ooo manufacturers. Its use to those engaged in purchasing the materials of chemical engineering is very great and the manner in which the publishers keep in touch with those who use the book is highly commendable. The information bureau maintained by the publishers for many years has been doing excellent service to its customers. More than 24oo books are listed in the technical and scientific books section. Information is also given concerning the American Chemical Society's Monographs. The book is printed in excellent form and very liberally illustrated.
HENRY LEFFMANN.