Vi CONTENTSERRATAVOL. 53, 1956.Page 237, line 17. For synthesis of oxyanin-B read synthesis ofT h e group at position 6 should be HO, not MeO.,oxyayanin-E.formula 61.Page 261, line 2.Page 263, lines 32-34.For pyrazolone read 3-aminopyrazolone.T h i s should read The authors suggest that thismay be because some of the 6-amino- and6-keto-groups form hydrogen bonds withother, unspecifiable, groups.VOL. 54, 1957.Page 36, table, colami% 4, lines 25 and 26.Pages 351 and 352.For 3-6 f 2.0 read 3.6 rf 0.2.T h e scheme near the bottom of p. 351 and formula(XVIII) on p . 352 should be interchanged