No coin nor oath required. For personal study only.
rhough not iinprobnlilc tlintn Iinndful of inid-ciglitccntli century pliilosoplicrs intcrcstctl tlictnsclrcs in pccriug a t tlic lxibblcs tlint rosc wlicn nails wcrc irnnicrscd in dilute sulpliiiric ncitl, tlicrc is yct good rcnsoii to tliink tlint the ncid itself was rcgnrdcil by soinc iiidustrinlists ns of conimcrcial iinportiiiicc. In 1771, wlicii Ward lind bccn drnrl n dccnrlc, and Rocback IVIIS 53, R. Wntson published " l'lnn of Chcmicnl Lccturcs " n t Cniii1)ridgc running into 10 L pages, nncl n short selection thercl'roni woultl i y q m r to I x gcrninnc to the question raised in : L rcccnt ctlitorinl : *' Vitriolic ncitl rcctifictl by distillation : \veal; acid coiniuouly cnllcd spirit of vitriol. Rcsitluuiti, strong iicid, iinpropcrly cnllctl oil of vitriol, *. Qunutity of mntcr nttriictcd froin thc air by n givcn quiintity of oil of vitriol, in :L givcn tiiiie, cstimntcd 11y cspcrimcnt : use of oil of vitriol ns nii hydromctcr. '. Acid of vitriol coiiiliiiicd with tlic fisctl alknliiic salt-Glc~tber's sal wiimlilis. Ccncrnl propcrtics of C;lrrullcr's Sdt." Oiic in:iy pnuse lirrc to rcninrk tlint C;l:iubcr's salt ivns strougly rccoiniiicndctl I J ~ 11. Mend, iirchintcr ((1. 1754) in tlic ti*cntmcnt of sinnll-pos :iiitl of hypoclirondrin (\Yorlis. 1763, 2 , 136 ; 3, 12G), and COI~SCquciitly woiiltl IN in deiiiiind from druggists. l'nssing ovcr 60 pngcs, Watson's syllnbns this coutiiiucs : '. Silver prccipitntcd I'IOII~ acid of nitrc Iiy iicid of vitriol . . . Salinc rcsitluiiiii crystidliscd." Possibly tlic Royal Niiit took ndvniitngc of this rciictioii tlicn, as IIOW, to rccovcr tlic copper iIs sulphntc, from tlic grrnt wrici,y of silver ingots sent for coinngc ant1 for tlic prcpnrntion of stiindnrcl silver so largely rcqiiirctl by tiic fnnioiis silvcrsmitlis of tlint pcriod. Siiiiilarly tlic silivr rrliiicrs of Birrninglinin. 'l'iiriiing f'roni this scholnstic nspcct * to \'iitson's '. Ibsny on Yitriols," wc ii1>l)rO~ch ncnrcr to tlie then coiniiicrci;rl practice : '. JIoclcrii e1iciiiist.q itl)L)ly tlic iinlnc vitriol to c \ ~r y coln1jin;ition of tlic ncid of sulplii~r with iiiiy inctnllic siibstnncc ; tlircc, Iio\vcvcr, of thcsc combinntions arc marc pnrticulnrly tlistiiigiiislicd, being of grcnt iisc in vnrioiis iiiniiiif~icturcs-Rrccii or iron vitriol, I)luc or copper vitriol, wliitc or ziiic vitriol. " Grccii vitriol, usctl priiicipnlly in dying (sic) nnd iiinkiiig id;, is ni:itlc i i t Dcptf'orcl froni n spccics of' pyrites fouiitl on Slicppcy Isle, Isle of \VigIit, Susscs niid .t)orsctsliiic consts." After i t clcscriptioii of tlic " fcr-
๐ SIMILAR VOLUMES
Sources of Supply of Chemicals.-Undcr prcscrit conditions i t is of coiisidcrnblc iniportnncc tlint cvcry ;issistnncc 1)c givcii to inqiiircrs for supplics of chcinicnls :tiit1 nllicd protliicts. Inquiries for products i n rcspcct of which tlic usuiil soit rccs of inforinntion lin\v fnilcd will bc n