u l o ~g way without iittciiipting to break iicw ground for the111sclves.
llic prcseiit voluuie niay be rcgnrtlcd ns Lriiigiiig tlie render and prospective user just so fur, niid pcrlinps iiot iniicli further ; but i t comprehends so wide 11 ficld of obscrvatioii and docs so with siifliciciit, tliorougliucss thnt both tliosc who iiectl nil iiitroductioii to the subject, niid tliosc to wlioin it, is iilrcady fninilinr will find the hook a helpful coinpniiioii.
'L'hc treatiiiciitopiis wit,li n ilcscriptioii of suitable ii1)1)iirlitlis, wliicli is, Iiowcvcr, coiifiiictl to locnl (β¬Jantiovcr) iiitcrcsts, iiictliotls of quiilitntivc obscrvntioiis :itit1 qiinittitntive iiiciisurciiiciits. Then follow a long series of classes of sit1)st:iiiccs which linvc I)ceii studied : inorganic sulJstuiiccs ; iliiiicruls, pciirls niitl precioiis stoiics ; orgaiiic coiii~)oiitids ; iiintcritr mcdicii ; tccliiiicnl materials fruiii ii wide rniigc of iiidustrics ; biologiciil, iiictliciil iiiitl put,liologiciil ; various foods ; forensic chcnistry : li~iiilly, tlircctioiis for pliotographic rcl)rodrictioii riiitl Iiiicroscopic obscrviitioii bring the treatise to :I close. X siiiiilarly cliissificd ditcrciturc, comprising 192 r(!fcrcuct!s niid 39 pliot~~grupliic reprotluctioiis, follow iiiitl coitipletc tlic vuluiiio.
' 1' 0 those firniiliur with the pliciiolticiiii, iiii~cli of tlie I)uol; will iippepl iis ii niunifoltl ring of tlic chiiiigcs~ for it is lirrgcly coinpilet1 of iiiiiiiy applicirt.ioiis of tlic mint method, but tlir. selcctioii of csninples is so liirgc atitl witln tliilt i I i i i i i ~ of tlic siiggestiom will co~iic US qititc iicw to all h t . tlioso iiiost widely cspericnccd. TWJ iiistaiiccs will iippcd :is illustrnt,iiig tlic csteiisivc utilit,y of tlic mctliod wlierc iliost otlicr iiicuiis fuil to give siiiii1;ir informiit ioii. l.'itrc corrosive sul)limntc csliibits litstle or no llriorcscciicc (1). IS), but iiiiy truce of culoiiicl occurring ns iiti itnpiirity produccs the clfect,. I n ultraviolet light oiic iiiiiy witch tlie forinutioii of culoiiicl oii coiituct o f iiic!rciiry with the ])crclhitlc, by leiitling