phenazines, prepared merely as derivatives of o-quinones or o-diamines, are of IitLle interest. Only compounds that appear of some potential interest are mentioned specifically although literature references in which there are descriptions of addit,ional compounds are given. In exercising such discretion t,he authors' conclusions will be different from those of a chemist engaged exclusively in, for example, dyestuff' chemistry, but the approach has been that of general organic chemists. An addendum covers thc literature up to approximately September 1956. A oount of 2320 reforenees (there is same duplication if the same citation i n made in different ohapters) shows that 48% of these are since 1930. I n tho chapter on Safmnines 31% of the citations arc from patents including those in which phenazine derivatives in color photography are considcred. The reference number of dyestuff8 described in the Colov Indez is given. The numerous miscellaneoun systems in whiah phonasine and its polybenza analogs are fused to heterocyclic systems other than the azine nucleus are of little intrinsic interest. They are considered in order of their Ring Indez enumeration. A number of systems that do not occur in this compilation, owing to their recent production or to inadvertent omission from the Indez or to their complex polpmeric nature are then considered. Suggested corrections of Ring Inrlez strurturr a1.e mentioned s s well as aorrcrtions from Volume 2 of this series. The ratio
of index to text pages is 7.3% (more than twice that of Volume 10 in the series). The printing and binding are well done and the publisher can he eomplimented on keeping the cost as low as 3.3 cents per page. Errors noted are incorrect formula XXII on page 128, XV on page 373, XXXIX on page 495, and XC omitted from the formula on page 577. The references from pages 472-93 are misnumbered. JAMES W. FEROUSON O R E ~ O STATE N COLLEOF Conv*LLIs. Onlaos
Editorial Castillo, S. A,-Madrid. The Philosophical Library, Inc., New York, 1958. Volume 1: viii 1611 pp. Volume 2: 1137 pp. 18.5 X 25 cm. $45. per set.
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Two bulky volumrs (1611 pages for English to Spanish, 1137 pages for Spanish t,o English) include more than a mem word equivalence vocabulary. By including idioms and brief explanations for untranslatable words, the editors have sought to "show the actual shape of the two languages." Only enginewing technology is covered (including commercial and legal terminology). This is not a dictionary for use in reading the scientific literature of physics, chemistry, or hialogy. W. F. Ii.
JOURNAL OF CHEMICAL EDUCATION
