Mr. F. H. ALCWK i n q i h -d if the insolliblo part of tho
lcnd compound had bccn scprntcd from tho solnblc p r t by means of ether, as wnr clone in phnrmacy whcn tevting Ernpf4tma Pl~i~nbi, though he feared it WILY nn imperfect met od. If such solventn were effcotivc tho I h t could be extended to such compratimly new solvcnts m carbon tetrachloride, ethylene dichloriclc, nnd acctylcnc tetrnchloride. Lmccd oil coulcl bo obtninrd fnirly p r o in commerce, although thcrc vnr no doiibt that i t comporitinn wiw complicated nnd variable. Dr. MorrcU hnd sthid tbat he attached nnme importnncc t o the s c p r ation of tho constitiicntn of the oil by tho bnrium and magncaium salt8 method. but had ho trixl the rilver snlta method of fractionntion 7 It wns nccrssnry to cxnmine carcfully thir and other oiln like olive oil for arnchir oil, nntl if it w m shown that n n c h h acid wns a normnl constitu?nt of thmc oib it would then bccomc a quwtion of amount bcforc adulteration could bc ccrtifinl.
Mr. F. R. OS~AUONESSP ollnclcd to tho cxtrnction of fatty mattcr from scrago nludge by cthcr. Tho ethvr oxtract was evaporated and the reiduc again treated with ether, but almut 10 per ecnt. rcmaind insoluble. A ahango rpparcntly took plnec in tho drxing proces : and hc wondered whether thc rmiduo WM R resinow M y .
Could Dr. 3forrcll throw m y light on thin ?
Tho CHAIRYAX inquired what effect the removal of tho acids from linnced oil had on tho drj'ing propcrtics.
Ih. MORREU, in rcplf:,naid there wnn a drawbnok in the uyc of &her 08 D so wnt, bccauso of thc difficulty in gctting a bright solution, owing to tho lend nolt remaining in auspcnsion. He prcfcrrcd t o cxtrnot with light petro-