with water (cn. 15 nil.) and the excess sodium nrsetiite titrnted with ntandnrd (0.02 N) iodine solution to stnrch indicntor. Blnuk deterniiuntiotis (5 ml. solvent rcplnciiig tlie solution of unenponifinl~le matter) werc cnrried out simultaneously. From tlie titre of periodic acid consumed, the prcentege glyceryl ether, 11s selncliyl nlcohol, was crrlculntetl.
DETEHAIJ~'~TIOS OF THE FORJIALDEIIYU?: &xEHATED IS T I E REACTIOSTo tlie osidntion iiiixturc, nftcr stniidiirg for four hours its iibove, wntm (30 ml.) IWS ndtlcd, followeil by N hydrochloric acid (9 nil., to give cb norninlity of HCI of 0-1-0-2 N) nnd N swliuin arsrnito solution (3 xnI.).1* The solution wns swirled thoroughly. %\'lien the colour geiienrted hnd ctisuppearcd, 60 ml. of it buffer solution (iiindc by mixing 1 volunic of 1.7 N iiydrochloric acid with 2 volnnies of 1.7 N sodiuni Iicetriter2) wcrc uddcd, and the whole filtered tliroiigli n pnd of filter-nit1 with gentle suction. The flnsk rriitl ptitl were washed with n furtlicr 20 nil. of buffer solutiou, nnd then with :iliont 10 ml. of wnter from ti wash-bottle. To the clcnr filtrate (pH .I *f;) 5% :tlcoholic dinledone solution (2 nil.) \ u s addetl, : l i d thc sollit ion thoroughly sliaken, uiicl nllowed to stnnd for 18 hours. The prccipihte v;ns then filtered off, in a tared sintcred gltrss crucible, and washed with distilled water. Drying wis cnrriccl out a t 85' for 20 minutes, and the crucible then cooled in rr c\esicc:rtor and weighed. A blriiik was usunlly curried out on the rcngeiits, hut was never found positive. Thc method is not regnrded us giving results to genter ;recurucy than about 1.5%.~\'ole.--\\'here the K-glyCCryl ether content of tin 11tisnp01ii~i:rb~e fraction was low, it wns alwnys ndvnutrigeous to use 6-ml nliquots containing more thnn 50 nig. of unsnponifinble nintter. In these cirses ethyl rrcetate wns tlic more useful solrelit, owing to the grc:itcr solubility of unscrlmouifinble ninttcr in this solvent than in ethyl nlcohol. The use of diquots yrcntcr thnn 5 nil. neccssitnted iidjustments in d l oper;itioiis subsequent to the oxidation, nud iii the cnsc of ethyl neetnte in particulnr, cnuscd unneccssnry diffic~~ltic~s.The nuthors nckno\vledgc fiiinuciol clssistnncc froni tlie h'ntionnl Hesenrch Couiicil and B o d , nud from the following industrial concerns : llessrs. Coiiccntrn (Pty.) Ltd., Messrs. I n i n und Jolinso~i (S.A.) Ltd.Tho totol sorption, and rut-of sorption of tnothyl hromiclu by rholu and milled wheat, by wheat glutonin.md hy wheat starch, havo tmn