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of "non-overlapping" spin functions would be preferable. In connection with the integrations on page 33 it should have been noted that d φ is an abbreviation for άφ1άφΐ . . . . and that the integrations are over all άφν Finally, the variation method, as ordi narily used, gives only approximate re sults. Consequently, it should have been emphasized that in the present instance the method gives the energies and spin functions exactly. The reason for this is that one is not attempting to approximate an oo -dimensional vec tor by a finite expansion; instead one deals from the outset with a finite di mensional space and the form of the correct spin functions is known in ad vance. On the whole, the text is quite good and will undoubtedly be favorably re ceived by many chemists. While it is impossible to predict what a given chemist can learn from this book, it is certainly true that the author's pri mary concern has been the education of his readers and not the impression of colleagues.
Now the 1962 edition is in preparation. Published in mid-April, it will go to scientists in 98.2% of all process industry research labs and to the more than 4,250 purchasing agents who place the orders for research products. ANALYTICAL 4 3 0 Park Avenue
CHEMISTRY New York 22
Treatise on Analytical Chemistry. Part II. Analytical Chemistry of the Elements, Volume 5. xxi + Jfi9 pages. Edited by I. M. Kolthoff and P. J. Elving, with the assistance of Ε. Β. Sandell. Interscience Publish ers, Inc., 250 Fifth Avenue, New York, New York. $16.50 ($13.75 on subscription). Reviewed by Donald T. Sawyer, Department of Chemistry, University of California, Riverside, California. This is the third volume to appear of Part II, Analytical Chemistry of the Elements, of the treatise by Professors Kolthoff and Elving. Earlier reviews of volumes from both Part I and Part II have discussed the scope and philos ophy of the entire treatise. The editors state that "Part II of the Treatise critically reviews the analytical chem istry, inorganic and organic, of all the elements." The present review is concerned with Volume 5 of Part II. The volume con tains five chapters by seven different authors: Titanium (Edward R. Scheffer) ; Zirconium and Hafnium (Richard B. Hahn) ; Thorium (F. S. Grimaldi) ; Nitrogen (A. J. Clear and Milton Roth) ; and Phosphorous (William Rieman III and John Beukenkamp). The high standards set by previous volumes are more than maintained by the present volume. In fact, the de tail and care in reviewing the analytical chemistry of the specific elements ap-
