Material is discussed in articles by 40 contributors. Concerning physiopathogenesis of epilepsies there are introductory notes, two articles on genetics, one on neurophysiological and metabolic mechanisms, two on renal failure, a discussion of convulsive seizure and water intoxication, three articles on hypoglycemia, one on electroclinical correlations during tetanic manifestations, and one study of electroencephalographic abnormalities. In a presentation of organic origin the following are included: an introductory article, a study of cingulate gyrus epileptogenic foci, and observations on the pathogenesis of the bilateral spike and wave pattern. Concerning neurophysiological bases are articles on pathophysiology of the EEG pattern, focal subcortical lesions, the evolution of ictal discharges, photomyoclonic epilepsy, seizure from a focal discharge, intracarotid sodium amytol tests, and evoked potentials of epileptics. Also presented are discussions of new findings by the contributors and a conclusion by H. H. Jasper. (JM)