the '' Colour Iuilcs ?' and siniilnr piiblicnt.ions. Su1)stnnccs sncli ns oils, fnts, nnil giinis, ~vliicli arc known to I)c niisturcs, also Iinvc I)ceii omitted. 'rlic cnt,ries in tlic Dictionary are on n strictly nlp1inbetic:il Iinsis, arid tlic rcvicn-cr ngrecs with t.lie coinl~ilcrs t1i:it this nffortls by fnr tlic siinplcst nic:ins of tracing n specific coiiipo~~ntl. 'I'lic nnnic iindcr ivhich :I conipoiin~l is cnterctl is t h t to wliicli prcfcrcncc is giwn hy clicniists in gcncrnl, bat wlicrc, ns i n 11 great ninny iiist:~~iccs, two quitc systcin:itic nniiics :irv possible, or ivlicrc n series of isoincridcs coiiltl 1~ grot1I)ctI togctlier undcr onc systcmntic nninc (ort.11iinilic :icid ctc. :ire intlcscd untlcr t,lic nnilincsiil~ilionic iicitls), cross-refcrcnccs will bc found in tlic appropriate plnccs. Generally spcnking, trntlc nntl proprictnry n:inics hnve not bccn givcn. Tlic full constit ution:il forniiiln is givcn for cncli conipo11nt1 (wlicrc t,his is knowi) ; in tlic c:isc of :I group of isonierities, howcrer, tlic forniu1:i of the first only is given. 'rlic tlntti given for cncli conipo~intl inclutlc, wlicrc p o ~~i b l e , pliysicril nnturc, inelting point, boiling poiut, solubility, tlensity, rcfrzictivc iudcs, optical nctivity, tlierninl tlnta, ino1eciil:ir wiglit, ; lirief piirticulnrs nrc nlso given of functiontil tlcriviitivcs, such as esters, Iialides, etc. of acids, ethers, and ncyl dcrivntircs of :~lcoliols, :ind so forth.
l'hc norucnclnture iind oricntntion ntloptcd are, in gcnernl, those in use i n 13ritisli cl1~1iiici11. litcr:iturc, i1lt11011gh in the ~> ~f i i c e it is ~t n t . ~t l t h t i. 110 sl)cciiil prcfcrcncc 11:is . . I m n givcn to :rny onc system to tlic csclusion of all ot.hcrs." 'I'he prcfiscs cyclo-, 110111o-, iso-, ctc. nrc iisunlly treated :is p:irts of tlic minic, but the system hiis not bccn quite consistcnt, since '* nllocinn:iinic :~citl *' is given only :i crossrefcrcncc to " cinnninic i d , " wl~crcas '. :~llnn~ticic ;icitl " nppcnrs iintlcr A. Agnin, iiuinlms I111vc l)rtw
iitloptcd in prcfcrcncc to Greek Iet,tcrs for tlic oricnt:it ioii of nliplint~ic coinpountls ; this ~netliod will r c c o ~~i ~~i c ~i d itself to ninny clieniists who find difiiciilty in rcmcni1)cring tlie position of a letter beyond, siiy, tlic fifth or sistli in tlic Grcck dp11:iI~ct. Also the revicwcr is glad to observe thit CIIO, CN, lint1 C0,H groups nrc rcg:irclcd ns substitucnts, nncl that conscqucntly their c:irl)on ;itom arc not niiniberctl.