arrangement of tprt and problems, and the unusually good explanation of the illustrative problems make this a n excellent toxt. Fine printing of a n easily readable type on high quality paper has produced a. book which is a compliment t o the printer's skill. This is a text which should find immediate adoption by many chemical engineering departments. I t has been written essentially for students. To his credit the author has not attempted t o make i t anything else.
B . E . LAUER Unzvemtg of Colorado Boulder Methods of Experimental Physics. Volume 3, Molecular Physics Edited by Dvdley Williams, Ohio State University, Columbus. Academic Press, Ine., New York, 1062. xiv 760 pp. Figs. and tables. 16 X 23.5 cm. $19.
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This is one volume of a six-volume series rovering the various areas of experimental physirs. Of the six this is probably t,he one of greatest interest t,o rhemists. The major areas covered in this volume are: Molecular spectroscopy (microwave, I. R., Raman, electronic), Resonanre studies (NMR, electron spin resonanre, quadrupole resonance), Mass spectrometrv, Molecular beams, Elertrir properties, and TTltrasonicstudies. The material inrluded is quite up-todate, including such recent innuvations as the use of optical masers as Raman light sources. Also, since earh rhnpter is written by someone in the field involved, fairly complete coverage of earh area is insured. The general approach in each chapter is t o give a fairly thorough +,he
