hook is a must. For, theoretically, it certainly points the way to furthcr understanding in an important, area, and, expe~.imentally,it offers a guide t,o ot,ilisntion, dodong ncgleeted in certain qnsrters, of steric effcets in the control of orgmie reactions. The editor is to be further complimented for bringing to the ioregound sovcrel of the young giant8 who hevo contributed significantly to the dynamic g ~ o w t hof theoretical organic chemistry during the past decade. The reader will recognize their names a8 iuthors of the chapters already cited and among the authors ai the remaining rhapters: Ernest, L. Eliel, Chapter 2, "Substitution a t sat,urztrd carbon atoms"; Gcorgc S. Hammond and ill. Frsdcriek Hswt,harrrc, Chaptor 3, "Steric effects in aromat,ic substitution"; Melvin S. Ncwmau, Chapter 4, "Ad
