Section I.- Introductory Remarks: Ruminations on Ovarian Function.- Section II.- Follicular Growth in the Rat: A Reevaluation of the Roles of FSH and LH.- LH-Induced Desensitization of the Adenylyl Cyclase System in Ovarian Follicles.- Gonadal LH receptors: Resolution from Adenylate Cyclase and Transfer to Heterologous Cells.- Prolactin Control of Receptor for Estradiol in Corpora Lutea of Pregnant Rats.- Chairpersons Remarks.- Lateral Mobility and Internalization of Hormone Receptors to Human Chorionic Gonadotropin in Cultured Rat Granulosa Cells.- FSH Stimulation of Mucopolysaccharide Synthesis in Rat and Porcine Ovary.- Immunologic Impairment of ?5-3B Hydroxysteroid Dehydrogenase and Its Effect on Ovarian Function: The Use of a Purified Enzyme.- Receptors for Gonadotrophins in the Ovine Follicle During Growth and Atresia.- Effect of Oestradiol-17? and Gonadotrophins on Prostaglandin Production by Pre-Ovulatory Pig Follicles Superfused in vitro.- LH-Stimulated cAMP Formation in Rat Granulosa Cells During Follicular Maturation a Non-Refractory Response.- Effect of the Administration of an Ovulatory Dose of HCG on the Subcellular Distribution of Follicular Protein Kinase.- Structural Analysis of Granulosa Cells from Human Ovaries in Correlation with Function.- Regulation of LH(hCG)-Receptor and Adenylate Cyclase in Luteinizing Granulosa Cells.- Changes in Responsiveness of Porcine Granulosa Cells to Prostaglandins and Luteinizing Hormone in Terms of Cyclic-AMP Accumulation During Follicular Maturation.- Some Morphological and Functional Characteristics of Cells of the Porcine Theca Interna in Tissue Culture.- The Control of Ovulation in the Cow by Prostaglandin Inhibitor.- Section III.- Steroidal Modulation of Steroid Secretion in vitro: An Experimental Approach to Intra-Follicular Regulatory Mechanisms.- On the Mechanism of Prolactin Stimulation of Steroidogenesis.- Steroid Secretion by Perifused Ovarian Follicles of Immature, PMSG-Treated Immature, and Mature RlSÑ