REVIEWS
GAS ASALYSIB. By A. 3IcCullocli. l'p. 166. London : Mr. 1\IcCulloch's book, wlijch lins bccn mrittcn priiiinrily for stiidcnts of fiicl technology, should prove liclpful to cvcryonc ns nn iip-to-dnt.c sniiiinnry of practicnl gas analysis. l'hc book is divided into eix cliaptcrs nnd nn nppcndis. Chnptcr 1 discusses such csscntinls ns tlic clcaning of iiicrcury, thc nccd for clean appnrntus, good, tnp grcnsc nncl nccurntc sampling methods, and points out tlic crrors inliercnt in normal gns analysts. Chnptcrs 2 and 3 nrc concernccl with thc various absorbents nnd rcactnnts and combustion mctliotls of analysis. Chaptcr 4 dcscribcs iu dctnil thc Buutc burcttc, tlic Orsat, Bucklcy-Siniintt, Bonc-IVhcclcr, nud Hnldanc nppnrntus, nnd thc iodine pcntoxidc mctliod for the cstinintion of cnrboii mouosidc. Chapter fi is conccrncd with spccinl dctcrminntions, such ns t l ~c cst,iimtion of siilplinr osidcs, sulphur, I)ciisoIc, nnphthnlcnc, aiiimonin, cynnidcs, nitrogen, iiitric ositlc nnd tar vnpoiirs in giis, wliilc Clinpter G discusses tho cstiinntioii and calculntion of cnlorific vnltics. Useful tnblcs of tctiipcrntiirc corrections, Iognritlinis, gns-volunic f:ictora, and rnrioiis pliysicnl properties of gmcs arc to be found in tlic nppciiclis.
'L'hc full nccounts giwn of tlic cspcriiiiciitnl tcchniquc in hnndling tho nppnrntus arc prticulnrly uscful ns tlic art of gas niinlysis is oftcii ncqiiircd with n scrjes of Iircnkngcs nnd crrors, which this book shoiild liclp to nvoid. Litcrntiirc rcfere11ccs nrc plentiful, nnd thc :iiithor lins skilfully nvoiclcd irrclcrant details concerning Tlic ctliylcuc glycol-phtlinlntc resin tlcscribcd oil p. 111 wns rcconiincnrlctl for iisc n t IOoo C. niid not lit rooiii tciiipcrnturc ; tho test, t i i h shown in Fig. 4 1111s n lip dcspitc tlic text to tlic coirtrnry ; tlic errors of niinlysis dcscribcd 011 111.~ 17--1!) tlcscruc n scpnrntc liending, niid Il'nble I ot tJic nppciiilis worrld I)c inwc w X i i l if 50-mm. incrcnwiit,s of prcssiirc over tlic wirlor rnngc of 0-700 iiiiii.