This subject is not new to the obstetrician, the neurologist, or the general practitioner. The purpose of this paper is to point out that cerebral complications not only occur during pregnancy but are commoner than previously noted. More detailed clinical examination plus the information made available through recently developed laboratory techniques disclose cerebral symptoms in the mother and permit early application of therapeutic procedure. The standard textbooks of obstetrics are woefully inadequate on the subject, and even the systems edited by A. H. Curtis1 and P. Titus2 devote only brief notice to the subject. The literature documents previous reports, and comprehensive reviews have been published. Among the best is that by Alpers and Palmer.3 They cite the early account of Ménière, in 1828, who was the first to show that puerperal hemiplegia could be due to cerebral hemorrhage. The frequency was low; Harrar4 reports one to