Bk. F. H. ALcocrr asked if Dlr. Dnvb had found sulphuric acid with tho naphthalena in tho distillate 7 110 would h a y thought it important to 8cok for othcr a c i b than prmc. Thoro niight lm preeent othcr things than naphthalono and picric ncid. It might LW, dvantagcous to add a volntilo ngcnt to tho spent oxido nnd then distil tho naphthalenc. Or tho boiling p i n t of tho liquid containing tho nnphthnlcno might bc raked by ndding salt, shaking tho di~tillnte with ether, nnd then cvaprnting slowly. He did not ngrcc that tho detection in gos w o r h spent oxide wos of little importance, bccnusc if its v n p u r could bc cnrricd to tlic houscs thcrc would lm n h t t c r illurninntion.
Ur. DAVXDSOS ropliecl that tho vaimur of nnplithnlcno woiild n f l o d no advnntngc. The boiling point was 218" C. The vnpoiir tension nt onlinary tcnipernturcs wns so low that tho gas couId not cnrrvO.W8% by votunic; and thnt wns only cquivnlcnt to tho light of n small fraction of n cnndlewser.
Mr. DAVIS, in rcpfr. enit1 he did not think washing of s p n t oxide with pic& acid would t w cficctivo in aonipfcs from tho Willinnis )recess, h o u s e nnimonin w w present. Further thcro would tw n lo= of naphtlinlcnc hfom tho process wae finished owing t o time rcqiiiml for woshing.
Manebester Section.
MceJing held at the G'rard
Ilolrl, on Friday, Xoretnkr 6th. 1014. -AIR. JULIUS 1l;USEB 1s TIIE CUAIR. THE OXIDATIOS OF SEWAGE \'ITIIOUT THE AIL) OF FILTERS. I'AIW 11. BY EDWARD ARDERS, H.W., dS1) WILI.I.431 T. LOC'KLXT, 31.SC.
I n n pnpcr* mwntcd to this Section of tlic Society in ~p r i i inst, n long series of experiments wcrc deecritwd dealing with the application of ncrntion iiiethodn t o the purificntion of scwngc. I t wasshown that thu accurntilntcd deposit designated I ' activutcd sludge " maultiny froin