soup. It therefore foriris itn excellent title and the little hook bearing it tells in its 136 pages ii grciit deal about this useful mitterinl. A section is devoted to thc history of soap, froin which it itppenrs that J a m s I granted a tnonopoly for it*s nianiifucturc i d that it was subject, t.o h s n t i o n in this country until 1853. Ouc wonders liow niucli longcr it will enjoy this rclicf, for it worltl production of nhoiit 5 niillions of toils must be tenipting knowledge to those respoiisiblc for rnisiiig nationid rcvenuefi. An account, is given of the iititxre and sources of t.Iic: rnw nintcrinls which, whilc necessary, is not neurly so interesting as t,lio tlcscription of soapitiitking itself wliich provides ii very rciidablc section. Toilet and test,iIt! sorips :ind soiip p v d e r s receive itidivitiual trentiiient :tiid it cliaptcr is devoted to glycerin. An index is provitletl itlit1 t,licrc is i i t i iippendix oil Eire JInzarcIs hy H. 'J'iiylor calling t,lie rittcnt,ion of t,lie inorc serious rciitlcr to an iniportnnt iisl)ect, of tlic intlustzy. This is t h fourth edition? : i d iitlvnntagc lms been t,aken to incorporate sonic of tlic. cliaiiges iii picticit wliich have trike11 pliice (luring the fotlr yciirs thiit Imvc clul)secd sitict. the Iiist edition. 'I'his lit,t.lc hook gives for trifling exlic!iiditure a n c!sccllctit return of itiforniiit,ioti hoth to the stutlent who \vatits iiti iiccwntc hiit not, tlctniled picture of the industry, iititl to the gcucral render who has little kiiowlcdgc of chemistry but sonic inter& in the t,liings it ciinlilcs niiin to prodtice. P. I'. H.
GENERAL AND PHYSICAL CHEMISTRY
L w i ~u l t s I';XIW~I~IENTS IS CJWIIWRY. By C; . PtiwIes, Bl.Sc. 1'1). s v i + ci(i.1. London : G. Ikll Lt. Sons, Ltd. 1937. Itis. 'i'hi~i~ book is not intcntlc.tl for use i n Uiiivcrsity COII~SCH, but iii scltool tcncliinp up to Srliool Ccrtificrrtc standard, irltliougli iiiiiiiy csperitiients iirc of Higher School Ccrtificntc or Interiiiediiitc stii1i(litrd. It, irlso contains nitrny digressions on teitc!liing inctliotls. tiftcr :tn introtliictioii tleirling with t,hc subjectof Iccturc. expeririients g(*licriilly :tiid wit.Ii the litcriit iirc, t,lic iiutlior gives i t i cliitptcrs 1-1V ii scqiicncc of psperinipiits iit iiii order wliich ciiii hi: used in tciicliing. Tlicsc rhirptcjs deitl, respectively, with water ctntl irir ; acids, I):tses, ntitl sirlts (beginning with tlic tlistill:it.ioii of ~o o t l illid tlic~ lumiiiosity of flitnic, iind iitclutliii~-ritt.lier iniippropriirtcly, it sewiis to tlic! rc!vic.\.rr-Iiytlrociirboiis and oxides of iiitrogcn) ; siilpliur i i n t l its coiitpounds ('. 11 scientific iinwtigiitioii " ns nil esritnplc of tcaclGtig nictltods) ; tlie liiilogcns, pliosphoriis, i i i i d silicon. Uhiiptcr ' tleitls with qItiitit,itiitivi! lecture cspcrinictits, c.speciinlly those illustritting Giiy-hssiic's I t b w of volutncs. itlid Chapter V I wjt,li t,lic pliy&itl priiiciplcs iintlcrlyiiig c:licttticrrl wtioii. An iq)l)ctiilix dcirls with irtetliotls of terrcliing chewistry rind is iiiteiitlctl to lie of ospcciirl vuliic to stii(li!iit.s i i t trttiiiittg.