introduction 10 t h r subject. .\s such it may find a useful place aiiiong beginning students. P a r t TI1 has son:r well-chosen rhapters but scems t o h r somewhat too brief and too lacking ~ four pages are devoted t o colloids and i n its attempt t o eover a large subject. 1 . c than living matter. L. H. R E Y E R S O S .
The C h e m z s f ) u of Portland cement. By R O B E R THERVAN BOGCE. Y V f 572 pp. S e w T o r k : Reinhold Publishing Corporation, 1917 Price: $10 00. This excellent book is \witten primarily for t h e cement chemist, and from the point of view of the research chemist ronrerned with the chernieal problems of the industry. I n these respects D r . Bogue is well qualified, having served since 1921 as Research Director of t h e v e r j effectiLe group under the Portland Cement .issociation Fellonship of the S a tional Bureau of Standards. T h e book is divided into three parts. Part I. The Chernistrv of Clinker Formation, deals n i t h high-temperature reactions in the dry state. P a r t 111,The Chemistry of Ccment Ctilization, is concerned with the reactions of cement n i t h v a t e r or solutions. P a r t 11, T h e Phase Equilibria of Clinker Components. is a n excellent prcsentation of the principles and techniques of high-temperature phase research, follon ed by a n extensive description of t h e system Ca0--.1I20~-Si0~(these three o\ides constitute over 90 per cent of commercial Portland cements) Then follow descriptions of other systems involving t h e additional clinker constituents LIgO, FeO, TiO?, F e > O i ,K?O, S a 2 0 , and L i 2 0 . T h e book has been very carefully prepared, and there appear t o be very few errors. T h e omission of b and c unit-cell dimensions for orthorhombic C a 2 F e ? 0 5on page 141, and the use of the tertii "octagon" instead of "octahedron" on page 112 may be mentioned. T h e careful reader may nisli that the author had been more c.ritical of some of the results ' reported, although hir completeness in reviciTing the literature resolves many of the chronologirally earlier errors. Thus the conclusion (page 1-11) t h a t a structure having the different interatomic distaricrs of Fe-0, Ca-0. Si-0, and A-0 could not produce a n x-ray ponder diffraction pattern of sharp lines is highly questionable. The two-page description of a paper by Flint and Wells (page 285 ff .) leads t o the very unlikely values of the second, third, and fourth ionization constantsfor the species €€,Si04 all on the order of 10-12,whereas they m a y reasonably be espected t o differ from one another and from the first ionization constant b y a factor of about loe4 or 10-j. The author's choice t o be less critical, as well as his decisions t o limit his discussion t o cements of the Portland class, and t o omit descriptions of routine tests have. however. kept t h e book from becoming unduly lengthy. The reinarkable thoroughness n i t h which t h e book has been prepared is quite apparent i n the (somewhat lengthy) history of cement manufacture, the careful documentation of ideas and results, the excellent list of references at the end of each of t h e thirty chapters, and the inclusion of many as yet unpublished investigations. This book will probably remain a n authoritative text for the cement chemist for many years t o come. I t should also bc of interest t o chemists in other fields and t o the non-specialist. particularly if he is connected with the rement industIy. T h e publishers have been especially careful in the presentation of the photomic1 ographs and electron-microscoI)~photographs in this generouslv illustrated book, and i n the reproduction of the many p~rlabelletl phase d i a g r a m . WII,I>I\\I 1- L I r s C o \ l R .
Ta6le o j t h e Hessel k ' i c u c t i o r i ~ . l o ( z ) an// J l i 9 ) j o r Complex di.yunzents. Second edition. Prepared by the 1Iathematical Tables Project, Sational Bureau of Standards. 381 1111. S e n I-ork: Columbia 1-liiversity Press. 1947. Price: $7.50 The tabular material is idcntical n i t h that in the first edition. Some minor revisions have been made in t h e introduction, including the rclation hetn e r n the tabulated functions on the 45' ray and thc her anti hei funrtlonq.
