It is probable that some degree of haemorrhage occurs in every case of cancer of the stomach, and that in many it is practically continuous ; but since its clinical recognition depends upon its severity and the coexistence of vomiting, its frequency has been variously estimated by different writers. Thus, Brinton noted haematemesis in 42 per cent, of his cases, Lebert in 12.5 per cent., Boas in 36 per cent., Osier and McCrae in 24 per cent., and Bosenheim in 50 per cent.; while in our own series it was present in 34 per cent. The clinical aspect of gastric haemorrhage varies according to the quantity of blood which is lost, and may be appropriately described under the terms ' slight,' ' moderate ' and ' severe.'