earlier pages of thc book. Unlike Firjans, ho\twver, the iiuthor concludes tliat covalence and clcctrovirlcncc arc distinct plienoniena, which do not bl~iiil into onc another. Thus *' ionic deformtion does not diiiiinisli the moment of the link by inorc than soinc %)yo, whilst tlie covalent link reduces it Tlic two prelinlinary chapters on " Atomic :ire follo\vcd by t wo cliitptcrs on tlie diiiiciisious and heiits of forination of coviilent links, tvliilst tlie two rciiiaining cliapters, occnpyiiig liciirly half tlic hook, dciil with dipolc nioiiients and with stcrcoelicinistry. Since the cheiniciil irspccts of stercoclicniistry up to 1927 ~e r c reviewed fully in liis earlier book, tlic iiiitlior siitiiiniirizcs tlic iitl.iiliCcs 111:itlc in tlie last seven yciirs, ;iiitl ~OIIOWS this iip with :i criticiil disciission of tlic plicnonienn.
Altlioiigli so11ic of tlie subjects now consitlcred Iiiivc I m i i discussed elsc\vlicrc iii reccilt publiciitions, the Corncll lectures provide :in interesting review of a topic of iiiiicli ciirrcnt interest, iintl will be widely \v&oriictl , cspeciiilly by t liosc \.IIo l i i i \ ~ rciitl the