BOOK REVIEWS uses of NMR techniques in colloid systems, all of which will be of value, particularly t o biologists. He also includes the recent, rather limited work on "bilayers" formed between two aqueous phase-films of obvious bheoretical i m ~ o r t a n c e t o the biologist. The author has a, definite thesis, which he states a t the beginning of chapter 3 and t o which he direct,s the reader's attention in many of the pages that follow. Dr. Xavanan is a t pains t o provide a mechanism for the change from an openand readily penetrated-to a closed membctne, s change in terms of which he proposes to explain protoplasmic streaming, active transport, impulse conduction, growth, contraction, etc. The meehaniam chosen involves a sandwich structure far the membrane. The outer layers of this sandwich arc protein networks and t,he "filling" of the sandwich eompriser; phospholipids and lipids. I n t,he "nnsqueesed," open state of the membrane, the lipid-phospholipid phase is in the form of cylindrical micelles, arranged with their long axes normal to the protein covering and with much open space hetween them. When the sandwich is "squeezed," the cylindrical micelles are changed into stubby himolecular lamellae whidl are closely spaced and leave little room for the movement of cell components in the interstitial voids. The mechanism is argued plausibly and consistently, but thereviewer wondem whether other models will be presented in \rolume 2 to offeet this rather one-sided picture of membranes. There is no doubt that practicing colloid and surface chemiats will find much here to suggest important topics still waiting t,, be investigated, and the ailthor deserves our thanks for bringing together subject mattel. which is widely scattered in the liternturo. The production is good, the format attractive, and attention to proofreading has obviously been rxreful. A n extensive hihliography and good indexes round oB n good proclnction.
ERICHUTCHIXSOS Stanford Uniuersit!i Stanford, Colilornin
Electronic Processes in Ionic Crystalr
F. Mott ed. Dover York, 1964. tables. 14 52. A'.
and R. Ti'. Gurney. 2nd Publications, Ine., New rii 276 pp. Figs. and X 21 rm. Paperhound
+
Origiually reviewed in
THIS
JOURNAL,
18, 246) (1041) in its first. edition, this
I h v e r paperback is an unabridged, unaltered replication of the second edition of t,his work whirh appeared in 1948. As stated by the authors in the preface t,o the second edition, ". . .recent advances i l l the subject lmve changed the t,heony very little.'' Therefore, few changes were incorporated in the second edition and the material remains useful in many fields.
.I. \-. I). A692
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lournol o f Chemical Education
