As to be expected, this group of lectures is as instructive and interesting as those of the past. The present group of eight lectures covers an extensive variety of studies: "Proteins and Proteolytic Enzymes" by Max Bergmann, "The Significance of Chimpanzee-Culture for Biological Research" by Robert M. Yerkes, "The Virus Tumors and the Tumor Problem" by Peyton Rous, "Relations Between the Parathyroid, the Hypophysis and the Pancreas" by B. A. Houssay, "The Interrelation of Cerebrum and Cerebellum in the Regulation of Somatic and Autonomic Functions" by John Farquhar Fulton, "The Influenzas of Swine and Man" by Richard E. Shope, "Malignant Cells" by Warren H. Lewis and "The Physiology of the Bronchial Vascular System" by I. de Burgh Daly. The respective subjects are summarized and interpreted by outstanding investigators in their particular fields. Time devoted to reading these lectures will be well spent.