ERRATA Page 326 22 23 51 1955 Vol. IX No. 4 line Formula?. The formula a t the extreme right of each row should carry a 5@ not a 5a- hydrogen atom. 1956 Vol. X No. 1 Ref. 1671 This should read Savage J . Appl. .Phys. 1948 19 1 ; Fullam and Savage ibid. p. 654. 9 For 50" read 750". 17 Formulae (28) and (30). For larger groups read smaller groups. These should read O M S II 'g \ ,c / \O/ \ L O M s Ii '\.%\ / - P h Me C \c/c\o/c\L Ph II kid 0 (28) (30) 1956 Vol. X No. 2 acid C,,H,,O,. OH at position 5. 173 7 For dracoic acid C,,HI4O read dracoic 177 Upper formuh scheme. I n formula LIII insert For (XLIV) and (XLV) read (LIV) and 178 Fo;mula I n formula LXIX transfer Me0 from 180 3 For (XVa) read (XV). 181 20 After farrerol insert a comma. 182 Formula LXXXIII. A d d e R = OAg. 230 Footnote. For J. 1952,3522 readJ. 1951,3522. (LV). position 6 to position 7.