The method finully devised \*:IS t,iisctl on the ~irctniso tlint it \viw hest, to iissunio thirt t'cle tleuitnitccl sulphuric ricitl ahonltl tic as conccntrnterl 11s possible, i.b., 43.5:(, II,sO, (&,) olitninnble wlien the feed is prclientcd nnd tho losses w e 11s stiitctl, 20% of tho stcnni input. Then, by cletcrniining stcnni!feed rntios for vnrious vrilncs of vnponr conipouitions, rising cold feet1 of tho given conqiosition ant1 innking out, lient. bnlniiccs using the nictliods iilrently describctl, it wns foiind tliiit n truu bnlnncc could be obtained for R myour composition of 12.5% liNO,/('u,) boiliig iit 102' c., stentn/fectl rntio = 0.431. Equilibrium conditions noultl iiot obtnin n t tho top of t lie coltinin. Tho corrected riitlintiori nnd convection lossos for tliesc cotitlitions were rc-coinpiiteil us 17 *8%, which is of the orclcr reqniretl.
It lins not been possil~lc to check 1111 the foregoing coniputcd resiilts in iictniil plnttt opcrntion, lint the inctliotls anti esiii~iplcs arc now edlectctl nntl rcportctl in tlic Iiclicf tliiit they will lie of mluc, pnrticulnrly ;it. tlic present tinia.
The iiutlior's tltnnks iirc tlnt: to the Directors t ~n d Jlunngcntetit of the Tlrerninl Synclicnte, Lttl., for perntis~ion to publish this pnpcr.
llccelred Ilec. 5 , 1912