ERRATAVOL. 42, 1945Page 224, line 1 , for (X) read (IX).224 ,, 2, for (IX) read (X).224. In the formula, for Progesterone the double bond shown betweencarbon atoms 9 and 11 should be a single bondPRINTED AND BOUND IN GREAT BRITdW BY RICHARD CLAY AND COXPANY, LTD.,BUNQAY, SU'FK)LK