The Physiology of Thought

boplastin inhibitor, mechanism of clot formation, zeta-potential, the conversion of prothrombin to thrombin, the role of platelets, and a synthetic anticoagulant. In addition, there is a special discussion of the general problem of standardization of thromboplastin. Those with a special interest in blood clotting from the clinical or laboratory standpoints can hardly afford to be unacquainted with the material in this volume. Others will find a wealth of information and much stimulating discussion. Some of the practical wisdom will remain inaccessible to those who do not read every page since there is no index. It is likely that the possibility of indexing such a volume was considered and discarded by the editor. We will be interested to see whether it may not be felt worthwhile in future reports. V. C. VAUGHN, III.