This book contains fourteen articles read at a conference sponsored by the Committee on Human Reproduction in New York City Jan. 30-31, 1948. The general subject under discussion was "The Normal and Pathological Physiology of Pregnancy," and the fourteen papers read were as follows: "Some Functional Activities of Trophoblast," by George B. Wislocki, Edward W. Dempsey and Don Wayne Fawcett; "Placental Dysfunction in Eclamptogenic Toxemias," by Ernest W. Page; "Patterns of Uterine Contractions in Women During Pregnancy," by S. R. M. Reynolds, L. M. Hellman and P. Bruns; "Pregnancy and the Thyroid Gland," by John P. Peters, Evelyn B. Man and Martin Heinemann; "The Excretion of Various Hormone Metabolites in Normal Pregnancy," by Eleanor Venning; "Urinary Excretion of Ketosteroids in Pregnancy," by Konrad Dobriner, Seymour Liberman, C. P. Rhoads and Howard C. Taylor Jr.; "Endocrine Patterns in Abortion," by Eleanor Delfs and G. E. Seegar Jones; "Experimental Studies on Nutrition