The reported incidence of hydramnios ranges from figures of 1 in 100 to 1 in 800 deliverit!S. Mueller (1948) quotes an incidence of 1 in 794 deliveries of the chronic form and 1 in 12,500 deliveries of the acute form. Macafee (1950), in a series, quotes an mc1dence of 1.25 per cent of both acute and