with statcnicnt and nutliority in tlic trniIitionn1 style.
Erirlicr pnrts alrciitly publishcd hnrc ilcnlt with the nictnl itself iind niucli of its chcniistry, so tlint licrc \YO find the cynnidcs, tlic compounds with n fcw, nininly Pourtli nntl Fifth Group, clcnicnts, nntl tlic nnnlyticnl clienlistry of iron only consitlcrcd. Tlic first nncl last of thcsc topics occupy tlic grciitcr part of tlic tcst. Fcrroiintl fcrri-cyrinitlcs of tlinnd tri-vnlcnt iron nnd of ninny otlier clcincnts and rndicnls nrc dcscribctl in great dctnil 110th ns to preparation and properties. Espccinl sections nrc dcvotctl to sricli of tlicsc compounds :is find IISC ns pipnicnts : tlicir colour, constitution, nnd colloidal propertics rccciw a trent incnt befitting their intliistrinl importance. A nnmbcr of coinplcs cynnidcs of organic radicals iirc tlcscril~ctl. Tliio-nntl nitrosocyanitlcs nrc nilequiitcly dcnlt with on siinilnr lincs although natiirnlly nt not so grciit n length ns the sfmigltl coniplcs cynnirlcs.
Sections follow dcvotetl to tlic conipouiids of iron contnining silicon, pliosplioriis, nrsciiic, niit iiiioiiy, and lismutli ; siicli as, for csaniplc, silicntes, donblc linlidcs ant1 the likc, but not tlic two-clcnicnt systcnis wliich wcrc dcscribcd in parts of tlic volume nlrcndy publishcd.
The concluding portion is n lcngtliy rind presuinn1)ly complctc account of those reactions of iron of cspccinl interest in its dctcction ant1 cstimntion. In addition to n fnithful rccoiinting of tlicsc renctions, tlic conditions gorcrning oxidntion and rcductioii arc cnrcfully considered and osidntioii potent ids, soliil~ilitics, :ind otlicr pli.sico-cliciiiicnl data of nnnlyticiil utility given in the fullest possible ninniicr.
Workers using this book will iiot occrisionnlly hnvc the satisfnction of finding what is usually rcfcrrctl to rather loosely ns ~y u l i c e evidctice r~liich may siirc t lien1 n great dcnl of trouble.
1'. L. l<ourssos PHEPARATIOS OF PIJRP: ISORoASIC SUUSTASCES.