Tlicrc is miich in this boolc wliicli will intcresl. the morc. expericnced melallogrnphist, nlthough primarily it is a boolt for tlic Rtiident. Froin its title i t will 111. gecn thnt thc author conccriix hiinsclf with nictnllogrnpliic prnctice, so t l i i i t tlic studcnt, with iin ncquriiiitancc with tlic coiitcnts of this hook will have more timc n t liis disposal to dcvclop the inanipulativc tcchnique of this important subject : cliaptcrs nrc tlicrcfore dcvotcd to pyromctry and pliotography. A Itnowledge of thc introductory tlicory of pyronictry and pliotographic npplinnccs is to bo cncourugcd in ordcr that the studcut inny use, the more intclligcutly, tlic various apparatus with which Le eoincR in contnct in tho normnl coursc of his work.
Thc book is an Amxican one, by riii Amcrican author, and oiic espccts to find iiumcrous rcfcrences t o the various Alncricnn mctnllurgicnl societies, and most of the refcrcnccs collcctcd at tlic end of cncli chapter irrq Americnn. TIIC nutlior dcals with thc preparation and etching of spccimcns for mncroscopic and microscopic cxnminntioii. Thcrc is u good chnptcr on special mctallurgicnl tcsts in which nictliods arc givcn for detcrmining grniu sizc in steels nnd non-fcrroiiu alloys, nnd the chnptcr on tho niircroscopic exnrninntioii of metals is well illustrntcd. Collcctcd to ctlicr in tho appendix nre the onc tlint can bc wcll recoiume~iileil. 21s. details of tlic vnrions c Q ching rengcnts. Thc book ie A. It. J. SAhlI*LINC AND ANALYSIS OB CAlrBON AND llLLOV STEEIS. JIETII0I)S OF TJlE CliENlSTS OF TIlE SUDSIDIARY COJlI'ANIES OF 'I'IIIC UNrTEV STATES STEEL CORPORA-TION AS REvrsEn TO 1937. Pp. 356. Now I'ork : Tlic licinhold l'ullisliiiig Corp. ; London : Chapiiinii and lTnll, Ltd., 1039. 22s. Gd.