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comparison of the two sets of data, obtained with SOIS prepared in a different manner, is only indicative of similar trends; however, with the exception of the chloride ion, the correspondence between the two sets of data is good. The variation obtainable between univalent ions and the clear distinction between univalent and divalent ions is again e demonstrated. Conclusions It is apparent from the data that nitrite, molybdate, tungstate and chromate fall in their respective class of univalent and divalent ions with respect to precipitating power; in other words, there is nothing distinctive about the inhibitor ions that
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would indicate that their colloidal properties are involved in the inhibitor mechanism. The fact that sulfate, a moderate accelerator, and nitrite, an efficient inhibitor, have precipitation values characteristic of their charge apparently means that precipitation of colloidally dispersed corrosion products is not directly involved, otherwise chloride and sulfate should both be inhibitors or, alternatively, nitrite should be an accelerator. Acknowledgment.-This work was done while the author was associated with the Institute for the Study of Metals, University of Chicago, and was in part supported by Army Air Force Contract #AF 33 (038) 6534.
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. BOOK REVIEW College Chemistry. By LINUSPAULING, Professor of Chemislry in the California Institute of Technology W . , H. Freeman and Company, San Francisco, Calif. 1950. x -I- 705 pp. 213 figs. 37 tables. 16 X 24 cm. Price, $4.50. In this book-one might almost say edition-the illuminating and unconventional approach of Pauling’s “General Chemistry” is still there, although in a more diluted form. The treatment of fundamentals is clcar and adequate, although the occasional obscure sentences of “General Chemistry’’ have been not quite completely eliminated. A t first glance the two books appear almost identical, but in “College Chemistry” the order of chapters has been changed-for cxample the treatment of g a m and gas laws is now considered much earlier-and material shifted around between chapters; the contents have been expanded by addition of more factual matter on metallurgy, manufacturing processes, chemistry of the common elements, biochemistry and photography including color photography. The printing of the book and also the illustrations have been improved and there are very few misprints. Thc main reason given for publishing “College Chemis-
try” is, it seems, the need for a freshman text “written in a more slowly paced and less mathematical form.” The attempt to achieve a slower pace seems to have been made in the main, by the omission of paragraphs on more sophisticated topics, except in one or two chapters, such as the onc on gases and gas laws, where a certain amount of rewriting has been done; many of the chapters, however, including the first five or so, have virtually the same wording as i n “General Chemistry.” The writing in a less mathematical form appears to consist in omitting the use of calculus in rate equations, thus bringing the book into line with most conventional freshman texts. A pity. I n this reviewer’s opinion it is questionable whether the average or subaverage freshman, to whom it seems popular to cater these days, will find the present book so much easier to understand than “General Chemistry” that its existence is justified. There is nb doubt, however, that Prof. Pauling’s “College Chcmistry” is one of the best freshman texts available a t the present time. DEPARTMENT OF CHEMISTRY HARVARD UNIVERSITY GEOFFREY WILKINSON CAMBRXDGE 38, MASSACHUSETTS
