SummaryCerebral hæmorrhage the prognosis of which is commonly severe does not seem to benefit from hæmostutics.Cerebral thrombosis, vasospasm or thrombosis associated with vasospasm do not seem to heal up by acethylcholin. On the contrary heparin and a powerful vaso-dilator, intravenous nicotinic acid, appear to be able to improve, even to cure these vascular accidents, sometimes in a surprising way.Cerebral embolism can sometimes be improved by combined administration of nicotinic acid and of an anticoagulant.In order to confirm these conclusions of personal observation and to settle statistically the early treatment of hemiplegia, Roskam asks for his colleagues’collaboration.