NEW BOOKS the authors' collection of information on colorimetric analysis. The text includes methods for organic compounds containing nitrogen, sterols, hormones, alkaloids, enzymes, antibiot ics, hemoglobin, natural pigments, and compounds with inorganic radicals. The material presented follows the same commendable format used in the preceding volumes. Brief discussions containing, in most cases, ample in formation for the analyst to select the proper method are included when more than one method is given for a com pound. Complete references, along with author and subject indexes, help make the original work rapidly access ible and eliminate time-consuming liter ature searches. The authors have thoroughly ex tracted the pertinent methods from the literature and presented them in a logical, organized manner. This book would be very useful in the industrial control and research labora tory. Organic Analysis. Edited by / . Mitchell, Jr., I. M. Kolthoff, E. S. Proskauer, and A. Weissberger. Vol. II. viii + 372 pages. Interscience Publishers, Inc., 250 Fifth Ave., New York 1, Ν. Υ. $8.60. Reviewed by
STANLEY WAWZONEK, State Univer
details for a complete summary of the field. This discussion inexcusably prop agates the common and unfortunate habit of polarographers of using the relationship #1/2 = E° -0.059 pH as a criterion for the reversibility of electrode reactions without information on the polarographic behavior of the products formed. The mechanism of the saponification of esters on page 21, the use of the term saponification with water and with acids on page 50, the representation of resonance on page 152, and the betaine structure on page 211 are not in accord with organic chemistry as it is taught today. This volume will be of great value to the anatyst, as it offers a selected list of good references on methods for determining functional groups and on the use of specialized instrumental techniques.
sity of Iowa, Iowa City, Iowa. The second volume of this series continues the program on analytical methods for the direct analysis of organic system outlined in the first volume [reviewed by S. Siggia, ANAL. CHBM., 25, 1776 (1953)].
The chapters vary in their critical evaluation of the methods and tech niques offered and in the amount of detailed directions presented. The dis cussions on the determination of esters, nitro, nitroso, and nitrate groups, methods based on reaction rate, phase solubility analysis, and countercurrent distribution are excellent from both points of view. The treatment of coulometry is critical but offers no specific directions for carrying out analyses. The chapter on carboxyl groups offers only a detailed procedure for simple titrations. The implication in the chapter on lithium aluminum hydride that this reagent is superior to the Grignard reagent is not war ranted by the data presented in the tables. Nowhere in this chapter is it specifically indicated how reducible groups are determined by this reagent. The chapter on polarography sacrifices both critical evaluation and specific
Practical Refractometry by Means of the Microscope. Roy M. Allen. R. P. Cargille Laboratories, Inc., 117 Liberty St., New York 6, Ν. Υ., 1954. $1.(30. This book is written especially as a guide and an aid to users of Cargille's "Index of Refraction Liquids for Micros copy," but it will be useful to all work-
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