The nppliciition of citrbon clcctrotles to tlilfcrcnt types of electric furnacc is then dealt wit I1 niicl pnrticnliir ottcntion is given to the iniinufnct~~rc of fcrrosilicon, ferroviinndium, phosphorus, nnd carbon clisulphirlc. Chapters twelvc iuid tliirtccn iirc dcvotccl to tlic iisc of carbon clcctrotles in fusion electrolysis nntl tlic elcctrolysis of :Iqucons solutions respect ivcly. Arc-lamp carbons, cortd i d othcrwisc, togctlicr with full details of their bchnviour, incliitling sl)cctrogriims, form t Iic substnnce of cliriptcr foiirtccn. Tlic ciirbon brush intlustry receives treatnicnt worthy of its irnportancc, tltc Iiietliods of testihg by tlic oscillogriipli bcing mcll illiistrittcd, whilc tlic finnl chitptcr tlciils with the niiinufncturc of battery cnrbons nnd ~nicroplione griiniilcs. A striking fcaturc of the book is tlic wcnltli of illustrtitions, of wliich there iirc 365, iintl studcnts in piirticiilnr should find thcni very uscful, iilthough n few of thc pliotogr~tplis of siniplc pliint nnd iniichincs nppc:ir superfluous Lccuusc they itre also illustratcd by cscellcnt line diiigritnis. H o ~v ~v e r , tnkcn as a wholc the book is very good i t n d it is csccllcntly bound. TIicre is ii coinbincd nninc i i n d subjcct intlcs. 11, 31.