~ ' c s o n a n ctheory ~ t o certaiii aspccts of this subject, there is no doubt that his attitude will provokr much new experimental work by the disciples of resonance theory. Interrunversion through hydrogen bonding in the enol forms of p-diketones (page 8) and thr dimrrs of siniplr carboxylic acids is apparently trealed as an application of resotia n w . This is nndoubtedly a casr of tautomerism and not resonanrr, s i w e the Iiydrogeii ittoin is nut aiiuated equidistant from the two oxygen atoms. Hydrogen bonds in general owe tlwir existence t o roulombic attraction. There are probably two idrntical minima i l l tlir i w ' r g y I S . internuclear distance ciir\,es for these molecules. -1 fc\v inconsistrmcies and sinall typographical errors are t o br noticed On page 59 it is stiitrd that, "Thr data thus suggest that primary, secondary, and phenyl radicals are niucli more reactive than tertiary or benzyl radicals." Yet o n page 60 one finds that "Tlie order of reactivity of alkyl free radicals, Io < 11" < III"." rtc, Ileference is made on page 31 t o the "polarizability of the elertriins." .\tonis a i d tiiolwules are polarizable, but t h c polarization of an electron is probably uut of the realm (if human imagination. .in o. atom is missing froin tlir quinune furmula on page X6, r r n d formula "B" o n page 102 cat negativr charge Iiy niistakr. This hook represents a distiiict cotit r i h l i u n t u thv ?lirniistry of ( ' a r b ~ ~ i - [ % r double b~~i bonds and should 1)r read ljy d l ot,ganic v l w n i s t s . .\I t w o w i l t s per p a g r . this viilunir is c r r t a i n l v iiot i w w p r i i w l 1
