I. Estrogens.- The Mechanism of Effect of Estrogens.- The Effect of in Utero Exposure to Diethylstilbestrol.- On the Teratogenic Action of Diesthylstilbestrol and Other Exogenous Sexual Hormones.- Uterine Tumors in Nonhuman Primates After Estrogen Exposure.- Morphological Changes Induced in the Human Uterus and Fallopian Tube by Exogenous Estrogens.- Effects of Hormones on Surface Structure of Human Endometrium.- Effects of High Estrogen Doses on the Endometrium.- Retrospective Histologic Examination of Endometrium in Curetting and Hysterectomy Specimens Following Estrogen Therapy.- Cytologic Effects of Estrogen Tests on Postmenopausal Vaginal and Cervical Epithelia.- Clinical Effects of Estrogens.- II. Gestagens.- The Mechanism of Effect of Gestagens.- Pharmacokinetic and Pharmacodynamic Effects of Small Doses of Norethisterone Released from Vaginal Rings Continuously During 90 Days.- Morphological Changes Induced by Exogenous Gestagens in Normal Human Endometrium.- Morphological Effects of Exogenous Gestagens on Abnormal Human Endometrium.- Differential Action of Sex Steroids on Ovary and Adrenal Cortex of Syrian Golden Hamster.- Clinical Effects of Gestagens.- III. Combined Hormones.- Morphological Changes in the Cervix and Vagina Induced by Combined Hormonal Medication.- Current Concepts in Steroid Hormone-Cell Interactions in the Uterus and Chick Oviduct.- Scanning Electron Microscopic Responses by the Endometrial Surface to Various Estrogens and Gestagens.- Morphological Studies of Structural Changes in the Tubal Mucosa of the Rabbit at Estrus and During HCG-Induced Pseudopregnancy.- Morphological Findings in the Human Ovary Under Physiologic Conditions and After Oral Contraceptive Use.- The Frequency of Spontaneous Abortion After Discontinuance of Oral Contraceptives.- Combined Exogenous Hormones and Ovarian Cancer.- Histologic Changes of the Cervix Uteri Following Contraceptive Use.- Comparative Study of Vaginal Cytology Involving Controls and Patients Receiving Oral Contraceptive Agents.- The Effect of Combination Contraceptive Steroids on the Mammary Gland.- Pathomorphology of the Female Breast Induced by Exogenous Sex Hormones.- Estrogen Receptors and Ultrastructural Pathology of Mammary Carcinoma.- Lobular Pattern of Mammary Tissue After Long-term Use of Combined Hormonal Contraceptives.- Closing Remarks.