Neurosecretion in Invertebrates.- Current Problems in Invertebrate Neurosecretion.- Neue M?glichkeiten zur fluorescenzmikroskopischen Darstellung neurosekretorischer Zellen.- The Mechanism of Hormone Release from Neurosecretory Axon Endings in the Calliphora erythrocephala.- Investigations on Neurosecretion in the Central and Peripheral Nervous System of the Pulmonate Snail Lymnaea stagnalis (L.).- Innervation of the Cephalopod Optic Gland.- Adrenergic Neurons.- Adrenergic Neurons (With Special Reference to Fluorescence Microscopical Studies in Mammals).- Electron Microscopic Studies on Peripheral and Central Monoamine Neurons.- The Adrenergic Supply within the Avian Hypothalamus.- Adrenergic Neurons in the Lower Spinal Cord of the Pike (Esox lucius) and their Relation to the Neurosecretory System of the Neurophysis spinalis caudalis.- Biogenic Amines in the Tuber Cinereum of Xenopus laevis Tadpoles. Electron and Fluorescence Microscopical Observations.- The Effects of Antiandrogens on the Hypothalamus.- Ultrastructure of the Median Eminence of the Toad, Bufo bufo, Following Transections of the Hypothalamus at Different Levels.- Investigations on the Hypothalamus-Neurohypophysial Neurosecretory System of the Grass Frog (Rana pipiens) after Transection of the Proximal Neurohypophysis. III. Ultrastructure and Hormone Content of the Distal Stump.- Mechanisms of Release of Neurohypophyseal Materials.- Mechanism of Release of Neurohypophyseal Hormones.- Electrical Discharge Patterns in Hypothalamic Neurosecretory Neurones Associated with Hormone Release.- The Ultrastructure of Neurosecretory Fibre Terminals after Zinc-Iodine-Osmium Impregnation.- Electron Microscopic and Autoradiographic Study on the Neurosecretory System of Albino Rats with Special Consideration of the Pituicyte Problem.- The Origin of Synaptic Vesicles in Neurosecretory Axons.- Hypothalamic Control of Anterior Pituitary.- Dopaminergic Pathways and Gonadotropin Releasing Factors.- Participation of Cenl«