Reproduction and Genetics.- Man, The Changing Animal.- Chromosomes and Genes.- Structure of Mammalian Chromosomes.- Quantitation of Heterogeneous Human Heterochromatin: Microdensitometric Analysis of C- and G-Bands.- Ultrastructure of Genetic Activity in Eukaryotic Cells.- Sex Chromosome Activity in Germ Cells.- Chromosomal Errors and Reproductive Failure.- Agonadism XY with Familial Recurrence.- Hormones and Receptors.- Molecular Basis of Hormonal Action.- The Mode of Action of Steroid Hormones: Some Recent Findings.- Progesterone-Progestin Receptors.- Spermatogenesis and Spermatology.- Endocrine Control of Spermatogenesis.- Genetic Aspects of Spermatozoa.- Response of Spermatogonia of the Mouse to Hycanthone: A Comparison With the Effect of Gamma Rays.- Ultrastructure of the Mammalian Sperm Head During Differentiation and Maturation.- Ultrastructure of the Sperm Tail.- Chemical and Structural Analysis of Mammalian Spermatozoa.- Inhibition of Spermatogenesis.- Ovum Development and Ovulation.- Central Nervous System and Ovulation.- Mechanism of Action of Luteinizing Hormone-Releasing Hormone.- Protein Synthesis Machinery in Growing Oocytes of Mice.- Follicular Maturation, Ovulation, Luteinization and Menstruation in the Baboon.- Physiological Studies on the LH-and FSH-Releasing Hormone, Its Analogues, and Antisera.- Induction of Ovulation with Various Regimens of Luteinizing Hormone-Releasing Hormone Administration.- Regulation of the Human Menstrual Cycle.- Electroencephalographic Changes in Women Treated with Contraceptive Steroids.- Ovulation, Corpus Luteum Formation, and Steroidogenesis.