J h t,rciitincnt of the subject is siriiplc ant1 orthodox, no profouncl knowledge of nintlienitit.ics is nssiinicd, iiiodcrii dc-clopnicnts, e.y., the theory of complete dissocintioii, iictivitics, fitgicities, ctc. arc nicntioiicd t o indicate not only the utility iind scopc of tlioories and dcfinit.ioiist biit illso tlicir liniitiitions. Encli chiiptcr closes with i i generous selection of past csiiniiiint,ioii questions. Tlic: book is \rcII prodiicctl, free from errors, ant1 iiiodcstly priced, ii1id rtiiiy be coiifitlciit.ly recoinnicntlctl to those bcginiiing tlic subject. The title might with ittlt'iliitngc II:LVC iiitliciitctl tlic elcinent.ary stop of the Illlok.
J. X. S.
7'lIlC
Qu'\sl.u.\l 'l'll~:ol~~ 01: \rAIrI:SCY. -By \', G. Penney, biit not undillg cli1bor~tctl, iilitl the nl1tlior lins nttcIii1Itcd JI.A., l'11.D. Pp. vii + 95. T,ondon : J l c t h c n S:
I his little book siiIiii1i:irizes soiiic of tlic recent iippliciitioiis of qiliititiill1 iiieclianics to the problcnis of riilciicy nut1 niolcculnr structiirc. h short iiitrorluction tlcnls with ntoniic wave-fuiictions, iiiitl then tlic I~Icitlcr-London theory of tlic liytlrogcii tiiolccule is csplniiictl in sonic dct:iil, and scvcriil iippliciitions itre tlisciissed. The other nicthod of forming niolcciiliir \rnre-fiinctioiis, tlue to Hunt1 nntl JIiillikcn, is ticst int,rotliicetl iiiid iipplictl ngiiin to tlic liytlrogen iiiolcciilc. A praisewortliy iitt.ciiipt is niiide to Iiclp tlic render to iilitlcrstiinil tlic complcs Iiotiitioii of this niet,liotl for the gcncriil