NEW BOOKS T h e r e is a conspicuous lack of figures a n d diagrams t h r o u g h o u t , a n d in m a n y cases their inclusion would greatly clar ify t h e discussed material. Also missing a r e references to related sources of in formation which might be useful t o t h e serious student. Finally, references in the text section t o p e r t i n e n t worked problems a t t h e end of each c h a p t e r would h a v e been helpful in correlating t h e theory a n d calculations. I n spite of t h e above criticisms, this book does help fill a g a p in texts avail able for t h e teaching of ionic equilib rium theory and calculations. It
t r e a t s ionic equilibrium in d e p t h a n d in this respect fulfills t h e a u t h o r ' s aims in writing a s u p p l e m e n t a r y text for gen eral chemistry a n d q u a n t i t a t i v e analy sis. A book of this t y p e deserves inclu sion into t h e chemistry curriculum b u t unfortunately a n already overcrowded schedule of courses m a y prevent its use except as a supplemental text. Standard M e t h o d s of Chemical Anal ysis. 6th e d . Vols, HI A a n d II IB, Instrumental M e t h o d s . Frank J. Welcher, ed. xviii + 974 and xi + 10Ιβ pages. D. Van Nostrand Co.,
Read Number-Average Molecular weight ia Miaules For speed and convenience in determining molecular weight (5,000 to 500,000 MW), you'll find it hard to steal a march on Hallikainen's Model 1361 Automatic Osmometer. Within 10 minutes of sample injection, osmotic pressure appears on a large digital counter within 0.01-cm accuracy over a 10-cm range. You can read four concentrations and calculate number-average molecular weight in less than an hour. With a simple exchange of sample inlet funnels, Model 1361 can be used for both low (35°C) and high (135°C) temperature work. No need to invest in separate instruments. The entire unit, including built-in chart recorder, occupies a trim 12x 15 χ 13-inch cabinet. For further information, write today for the informative four-page brochure.
HALLIKAINEN Instruments 750 National Court, Richmond, Cal. 94804 Respondents living outside North America, South America, and Japan are invited to address their inquiries to: Hallikainen Instruments Ltd., Blackwall Lane, Greenwich, London SE10, England. Circle No. 110 on Readers' Service Card 70
A
·
ANALYTICAL CHEMISTRY
Inc., 120 Alexander St., Princeton, N. J. 1966. $ΰ0 both parts {not sold separately). Reviewed by F. E. Beamish, De partment of Chemistry, University of Toronto, Toronto, Ontario, Canada. This book, prepared by 86 a u t h o r s , contains in Volume A a discussion of 41 i n s t r u m e n t a l m e t h o d s of analysis in tended to provide a general u n d e r s t a n d ing of t h e principles of i n s t r u m e n t a t i o n ; as well as t h e scope, advantages, a n d limitations of each technique. E a c h m e t h o d includes a discussion of the basic principles a n d t h e required equations, t h e a r r a n g e m e n t a n d o p e r a tions of the functional p a r t s , a n d de tailed direction for each step of t h e technique. P a r t I I of Volume A a n d Β deal with t h e application of t h e instru mental m e t h o d s to special materials which in general a r e t h e same as those of Vohime I I with some exceptions in t h e ease of those materials which have received adequate coverage in Volume I I of this scries. Included in the chap ters dealing with materials are new chapters on food a n d semiconductors. E a c h of the 23 chapters on materials provides practical information on m a nipulation, accuracy of measurement, a n d potential sources of error for t h e various instrumental methods. In Volume A all of t h e i n s t r u m e n t a l methods which are included, while t h e y cannot be considered s t a n d a r d m e t h o d s in the sense used in previous volumes, have been widely used, or a t least, ef fectively used for various purposes for which a n o n i n s t r u m e n t a l m e t h o d m i g h t have, for a n y reason, proved to be in ferior. I n addition, methods h a v e been included where t h e y are known to be useful in solving special problems a n d where they m a y be helpful in suggest ing possible approaches for t h e develop m e n t of other required methods. T h e design of t h e volumes will stimulate in terest in t h e extension of t h e various in s t r u m e n t a l techniques t o t h e solving of analytical problems. T h u s , it is not only a book of recipes b u t also a source of inspiration for the analytical r e searcher. Essentially, while t h e book is directed t o w a r d t h e practising analyst, it should be within t h e reach of t h e a n a lytical novice a n d most certainly it should be a t t h e disposal of t h e research analyst. Some of the chapters—e.g., t h e electrometric a n d radioisotopic methods—could be considered in t h e n a t u r e of an u p p e r level analytical text book with details a n d information of practical value too often lacking in those a t present available. However, there is a degree of oversimplification in some of t h e descriptions of i n s t r u m e n t a l methods inevitable in a treatise so com prehensive, a n d in such instances—e.g.,
