CtIE311STltY AKD IX IIUSTRY, 583 ntitl ittctliotls of iiiccliiiiiicnl and tlicriiinl treiitnicnt. Following tliis gciicr:il scctioii conie c1i:tpters on the ilictiill1irgy of iron nncl steel, iind 011 the nietnllurgy of t,lic noii-ferrous ~nctnls. tl stuclent n-ould be nblc to dcrivc n good geiicrnl kiio\vledgc of tlie priiiciplcs of iiictiilliirgy froiii tliis hook, though lie would find, d i c n lie sets out. to iicqiiirc tlic kiioirlctlgc of spcciiil technique wvhich, it is cliiiiiicd, is fiicilitittcd by tliis book, tlint thc clciir stiltcliictlt wliicli secliicil SO siitisfyiiig in tlic study ~vorild rcquirc not ii little quiilificiitioii in tlic shop. Thus iicccssity for (liliilificiitioli, of coiirsc, is iiot unconiiuou in t,hc triiiisitioii froiii stiitlciit tliiys to intlustriiil work. hut oiic iiiiglit tliiiik t.liitt more itiforniiitiori could 1i:tvc bccn givcii oii steels rcsistiiiit t o heat niitl iicids, 011 t,lic tiewer Icnd iilloys, iiticl siiiiiliir poiiits wliich iirp of iinportiiiicc i n clieniicnl iiidustry. 'L'lius it is stilted tliiit " JIolicl iiictiil, which is very li;trd, is utilized for tltiit rciisoii in piirticdiir to initkc tmbinc I~lndcs," and no iiieiitioii coulcl bc fouiid of tlic wcll-known 18-Y steels. 'l)ifficiiltks iirc 1)otiiid to occur wlicii gcnernliziiig, iiiitl t Iiougli the I)ook wn be rccoiiiincnilcd ns i i t i iiit.rotliictioii to iiictiillurgy, oiie feels tliat, for the clictuicnl stutlciit, cliciniciil iieetls might Iinvc h e i i tiiore closely coiisitlcrcd: CAI~UOS JJI0XIt)K. l3y It. 11. Qiriiiii i i t d C. I>. Jolics.