CHEMICAL REVIEWS EDITORIAL BOARD W. A L B E R T N O Y E S , J R . , Editor L O U I S E K E L L E Y , Assistant Editor
E. R. GILLILAND
R. C. E L D E R F I E L D C H A R L E S G. K I N G W A R R E N C. JOHNSON
L. O. BROCKWAY NORMAN D. SCOTT
V O L U M E 30
PUBLISHED BI-MONTHLY
FOR
T H E AMERICAN CHEMICAL SOCIETY BY T H E W I L L I A M S & W I L K I N S COMPANY
B a l t i m o r e , U. S. A. 1942