318 CHEMISTRY AND INDUSTRY 3 h y i , 1020

111 tlic first part tlic author dcscribcs nictliods applicable t o purc s u b ~ t a ~ i ~ e s , including methods for tlic deteriuination of atomic aiid molecular masses, and of the constitution of complcs substances. The sccontl part dcals with mixtures, solutions, and hetcrogcncous systems, and the main practical features of tlic problems prcscntcd by such systcms arc illustrated by dircct rcfcrcncc to actual csamplcs which have bceii sclccted with duc discrction. No nttcnipt is madc to dcal with thcorctical qucstions, and the abscncc of instructions for actual cxpcri- incrital work docs not pcrinit thc.-book t o be used as a laboratory guide. This circuinstancc is cviclently rcaliscd by thc author, arid by way of coiupcnsation hc has added an appcndis of soinc 80 pages, in which a somewhat cursory description is given of ccrtain picccs of npparatus and of tlicir actual use. The appcndis, liowvcr, is much tlic least satisfactory portion of tlic author’s publication. In other rcspccts this caii bc very warinly rccomincndcd as a clear aiid coiicisc csposition of subject rnattcr which is indicated in tlic titlo of tlic b001;. H. 31. DAWSON

A I)wrios,iny , oi: kPPLTICI) CrusaiIsi~Ry. 735’ Sir E. TitowE:, C!.l3., LL.D., P.R.S. VoI. VI. S. ACID’-TETRYL. licviscd and cnlargctl cditioii. Pp. viiif701. London : Loiigtiiaiis, Grccii and Co., Ltd., 192F. Pricc S:l.

A plcasing variation in tlicsc times of rapid change and hustle is tlic ~icriotlic appcarancc of a iicw cdition of a scicntific classic lilrc Tliorpc’s “ Dictionary of Applictl Clicniistry.” Tt,s vitdity is a iiicasurc of its uscfiiltiess, ;ind nn indication tlint tlic crlitors arc fully iilive to tlic iniportanco of lrccping iwll a,brcast of tltc. rapid adrnnccs in pitre and applicd cl icui is t,ry.

Owing to thc tlcatli of Sir Etlirnrtl Tltorpc, tlic final prcss rcvision of tlic rolunic untlcr rcricw line bccn carricd out by Dr. Ti. Forstcr i\Iorlcy, wlio is to bc coiigrntulatctl 011 tlic siicccss of liis labours.

Voluine Vl’ (S-acid to Tctryl) coinpriscs 791 pages, compared with about 680 pagcs (par~ly in volume IV and partly in volumc V) for thc corresponding part of tliu last edition. All tlic niorc inq~ortnnt articlcs I i a ~ c bccil brought up to diltc citlicr by tlic contributor to tlic last edition, or, wltcre this \\.as not possible, by an cqunlly \\dl-lciio\rn specialist. l’hc result of this rc\+sion is seen in tfio largo iiicrcase ill tho number of ptigcs.

Thc main contributions rcsponsiblc for tliis incrcnsc arc tliosc on Salicylic acid, Saponification, Selcniuru, Wcwagc, Silicon, Silk, Silvor and it,s compouiicls, Soap, Socliuni and its conipouncls, Soils, Spccific Gravity, Sj)cctroscopy, Stnrcli, Sugar, Sugar analysis, Sulpliitlc tlycs, Sulphur, Sulpliuric acid, Syntlictic drugs or medicinal products, ‘J.’nrtaric ncid, ‘h l l i i - rium, Tcrpcncs, !l.’ct~ali~drona~,Iitli~lc~ic and its derivatives.

In a short iioticc of it voliinic of sucli divcrsificd contciit it is impossiiblc to go into details. It must sdiico to say tliat the information, wlicrc tahxl , is ncciirato aiitl up to dntc ; tliat, although doaliiig profcsseclly witli applied cliomistry, tho purcly scientific Nido lins not ljccn ncglcctcd ; and that

contributors, editors and publidicrs arc: alike to be congratulatcd on a production whicli is in every \say a n;orthy continuation of the long linc of editions of t,tic. almost indispcnsaJ)le. ‘‘ Thorp’s Dictionary.”

JosErrr KNOX

- ~ T L I E I ) CIIE>IISTRY. Bj7 c. IiEXNETrr TIXKLISR, D.Sc., and Hlzces RIASTISRS, B.Wc. Vol. 11. WOODS. Pp. siC2iG. London : Crosby J ~ c l c - ivootl and Son, 1025.

!L‘hc titlc of the boolr gives little indication of i ts scope or piirposc. I n the prcfacc i t is statccl that i t is intcnclcd primarily for students tnlring tlic course in applicd cliemistry for the dcgrcc of B.Sc. (House- liolcl aiid Social Scicncc).

Tlioiigli esscntially a laboratory manual, each section is prcfaccd by a short theoretical trcntment of tlic subject. Thcsc bricf notcs arc in some cases SO short tliat it is doubtful if they arc of ruucli value. Sis pages only arc dcvotcd to the subjcct of meat and mcat products, iiuluding a classification of the proteins. ’l’lic authors liarc, lion.cvcr, supplicd nniplc rcfcrcnccs to otlicr publications from which tlic stutlent can obtain furtllcr information.

! L h practical work is well clcsigncd to girc thc stuclcnt a gcncral insight into tlie composition and charactors of foodstufTs. !L‘lic analytical proccsscs described usunlly follow acccptcd practice. Tlic t,rcatmcnt, liowcvcr, is ratlicr uncvcn ; sonic pro- ccsscs nrc given in detail, whilst otlicrs arc dcscribcd in gcncrnl terms, rcfcrcncc bcing iiiaclc to otlicr publications for dctnils. Tlic practical work includes not, only food analysis and tlic dctcction of somc prcservatircs and poisonous sul)st,nnccs, but also n.ork to 1)c carricd out in tlic liitchcn laboratory,. e.g., csperiincnts on tlic coolring of milk and vcget- ablcs, brcad-making and sugar boiling.

!l!liis 1~001~ covcrs a lnrgc nuiuber of subjects OIL cnch of wliicli volunics Iiaw ,been written. ‘l’lie authors havc bccn succcssful in treating tlicsc subjects i n n suficicntly full manner for students who are tnlring n course iu houscliolcl and social scicncc.

Pricc 15s. net.

H. L. S.

Tlllr CllEAlISTRY OF DltUaS. 13y hT. EVERS, 13.s~. l’p. viiii-247. London : E. Bciiii, LM., 1926. I?riec 32s. (id.

!VIE publislicrs clnim that. this book is tllc first csliaustivc account of tlic clicinistry of drugs, in- chiding clicmicnl constitution, rcactions ant1 syn- tliescs. Tlic a,ppearancc of this book a t a tiinc whcn tlic rcvisioii of tlic PluirtiiacopociiL ig undcr. consiclorstion is botli timcly and wclcomc, particularly as tlic author is in closc touch wit11 moilcrn chcmicnli mnnufactiiro.

Tlic classification of drugs is alwnys difficult, but tlic nutlior Bccnis to havc elioson a suitnblc method- ]?art I, Syntlictic Dnlgs ; Part JZ, Drugs of Natural, Origin. A ~rclcomc featiirc of tho book is tho iii- olusion of adcquutc practical detuils, sclcctcd botli from tlic original literatim and from tlic author’s. cspcriclico. This will cnablc tlic Rtudcnt to carry out laboratory ascrcises wliiclt will givc good yioldr.