CHEMISTRY AND INDUSTRY
117 \v!tcti thcy stntc iii tlic I>rcfiicc thnt ii tlic volutiic is tlcsigncd to give tlie rcndcr n fully lip-to-dntc nnd rcnsoii-riMy :uxuratc nccoutit of thc ktio\rit fncts and the theories tlint innrk tlic modcrti scicticc of pliotoprtipliic j)rocessft~.'~ If they 1 1 n ~ not quite acliievctl all t,licy sct out to do, they hnvc produced n w r y rcndnlJle littlr. booli wliicli shoultl provc uscfd to 1iiniiy pliotogrnplicrs. It iiiiiy I)c tloitbtcd ivhctlicr tltc first part, iiti introdartion t o clicmistry, is just.ified in its l)rcsctit form, and wlictlicr :I sitiglc c!tiiptcr of tlcfiiiitiotts \voiiltl ]lot IX ndcqltiitc, lcnving ~iiorc spncc for cssc~it~iiilly pliotogni jhic n1:itcrinl. 'I'ltis \voultl pcniiit of n \VC~COIIIC cspaiision of the lnttcr p i r t of the \vork, ivlticli dcnls svit,li ticgiitivc proccsses, development, ~wiiit.ing-out piipcrs, ctc. Tlterc is ii good list of pliotogriipliic clictiiicrils, ivitli tltcir propcrtics nttd IISCS, i i t i t l it list of solitlilitics, coticlitditig with n somewlint iiiiitlctluiitft iiitlcs. Thcrc arc ii tiiinibcr of slips in tlie test iititl 11 fcw 1tiisstiitciiictits, which do not, Itowcvcr, c1ctr:ict froni t,ltc itscfulttcss of the book, \vliicli is quite the best of its kind t,ltnt lins hccii publislictl ;it, so low it price. A wort1 of pmiac is due to the publislteis for tlic wry csccllcnt pritititig nntl tlic freedoin from typogrnpliici\I errors.