“…Chattam (1959) gave an average of 2.5% of 2,932 deliveries at Oklahoma, Lucy (1960) 2.6% of 7,552 deliveries at Jamestown, North Dakota, Mulla and Bates (1961) better care. The Caesarean section rate for large hospitals, however, is not a-very good guide to what the approximate incidence of this operation should be, because of the problem of selection.…”