Page Line 67 10* 68 12 8,* ERRATA 1951 Vol. V No. 1 Equation should read X = s(1 - C)Y 7,* 3,* and 2" for ethylene read ethylene dibromide for X read s 1952 Vol. VI No. 4 320 reference 8 for J . Chem. phys. read J . Chim. PhYS. 1953 Vol. VII No. 3 230 reference 19 should read 0. Hassel and E. Naesha- gen Tidsskr. Kjemi 1930,10 $1 ; Zentr. 1930 111 1956 * From bottom of main text.