As for tho nfter-conversion of the pcntnsulphidc itself iiito tliiosulplintc, wc hnve to rccognisc, first, tho occiirrencc of itsliydrol sis into cnlciuiii Iiydrosidc, ~iyt~rogcii eu~li~iit~c, nnt1 s&~iiir, n, fnct nlrcndy s~ioivn iii this pnpcr to bo cstnLlidict1; sccondly, tho ntniosphcric osidntion of tho Iiytlro~~cii of tlic liytlrogcn sul ) ~i i t l o ; tliirt~y, tlio renctioii 'Lctwecii tlio SUI )bur niid tliis niit1 ntlt~itioiin~ liiiic to forin tliiosii~ h c , witli, ngniii, soiiic ~iciitnsulphido * niicl, fourt 1 ily, n succcesion of tliesc cliniigcs by wliicli tlic ]icntnsu~pliido rcciirs in lcss nntl lcss qunutities do\w to iiotliing.
Tho nftcr-coiirersioii of tlic peiitnsnl~~liidc into tliiosiilplrnto cnn tnkc plnco iii this iiiniincr coiiipletcly oiily \vIicii it is iii coiitnct with the liiiic of tlic wnste. '\Plicrc it is tlccoiii JOSCd Ly tlic nir in nbscncc of liiiic, but two-iift~is oT its sii~pliiir cnii bccoiiic tliiosulplintc, tho rcst bciiig \cfL. frcc ; while if tlic coiitnct wit11 nir is too cstcnsivc, liytlrogcii siilpliitlc \*Ill cscnpc aiitl soiiic liiiic Lc Icft, with, of COII~SO, lcss c ~c i i tlinii t\vo-fiftlis of tlic siilpliiir ns tliiosul~ihate.
J.nstly, uhm , " ycllow " lirliior is usctl to lisirinto fresh wnstc, tho sup dy of liiiic will Lc too siiinll for tlic coiircrsioii of rill sulpliiir into t~iiosiilpliatc wlicn the lisiviuiii rencts with the nir, niitl tlicrc will coiisc uently bcsulpliur tlcpositctl niitl liytlrogcii sulpliitlc n-ill cscnpc. I t was cscnllc of liydrogcn siilphidc froni this causc tlint rcntlcrccl this iiiodo of lisivinting uiiiiinna vealle iii tlio liniitls of Alnctcnr. Oiirittiiig iiitcrinctiiatc stages, tlio ctluatioii giving tlic result will show thisc'uS6+3c'aS,LI, tG0,=JCnS20,+3SI.I, mid with a greater woportioii of ~iciitnsulpliide, or by tlio nctioii of stid iiiorc osy 'cn, m l p ~u r will LO depositcd. A thick p s t c of +I ycllo\v ' liquor nnd solid wnsto niny (theorcticnlly) bc oxitliscd by tlic nir, without libsration of citlicr sul~iliiir or hydrogen sulphido, thus-C'nS,+3CnSLI.011tG02=4CnS,0:, t3011, Jnmcs Xnplcr. jnn.
T. 1,. ~nttcrrjoii, F.1.C..