S'oah
;Pe&
not for an ionic lattice which is the example chosen for the figure. Also h's (page 9) is the energy to transfer two ions separately and not an ion pair from the interior to normal lattice sites a t the surface. Such lack of precision in definitions and in discusnions of concepts is evident s t a number of places throughout the book. One gets the impression that the editing has been hurried; there are unnecessary repetition^. Far example, essentially the same account of the Hall effect is given twice with different figures and symboln (pages 32 to 34 and 69 to 72). The Tsmmenu temperature is defined in st loast
good a i d thefigures are &ll drawn and reproduced. I t may be asked, however, why the chapters are not numhcrcd in the body of the book. Misprints are more numerous than is desirable but fortunately most, are immediately obvious, for example: Pokl (page lo), Pcirls (pages 21, 24, 5001, adsorption of light (nag? 120). An exception to this occurs an page 100: ~ilieonchloride should be mdiurn chloride. For the expert already acquainted with the fundamentals of the subject, the book contains a good deal of informat,ion, some 01 which has not appeared elsewhere. However, in the balance, it must be concluded that this is not the definitive book on the defect solid state. J. A. MORRISON N A T ~ N *RLE ~ E A ~C CO XUNC~ OTT*W*2, C*X*"*
DICTIONARY OF PHOTOGRAPHY Edited by A. L. M. Sowerby, Editor of "Amateur Photomaoher!' London. Eiahteenth edition. Phifosophical Library, I&., New York, 1956. 726pp. 12.5 X 1 9 em. $10.
S ~ N Cthe E appearance of the first edition in 1889, this book has continued to h d wide use among practical photographers. The present editwn ineludos revised sections on cinematography, color photography, and flash work. Although written in England, American formulas, films, and papers are inrluded. The book is intended for the skilled amateur or nonidpeeialist professional and sppcam to serve the purpose adequately. WILLIAM M A C N E V I N UNIVERBITY OHIOSTATE co,.umus, 0 ° K
CHEMISTRY MAGIC Kenneth
M. Swezey, Brooklyn, New
York. McGraw-Hill Book Co., Inc., New
+
York, 1956. x 180 pp. Many illustrations. 15.5 X 23.5 nn. $4.50. THIShook is suitable for the high-school student, t h e science club, or t h e highschool teacher looking for additional demonstrations to create interest in science. Most of the experiments are exciting, easy to follow, and well illustrated with many
(Continued on w g e Ad96) JOURNAL OF CHEMICAL EDUCATION
