MOHAN-THE MANUFACTURE OF CONDENSED MILK.
1O!l than when climetliyl siilplinte is used instead of sul huric acid. Linseed oil with dimcthyl snlphntc rinz acctic anhydride gircs n grccnish colour.
Thc above obscrrntion iiiny be considered ns cridencc of tho fornmvon of n ring substnnec l ~f o r c gclatinisntion. l h c invcstigntion of tliickcncd tring oil is in progress, and the results will form tlic subject of niiotlicr pnpcr.
S U ~~I A I W .
(1) Linseed nnd poppysccd oils cont.nin mixed glyccridcu of vnriatllc nn\ounts of unsnturatcd acids, in addition t.0 sinnll qunntities of sntirrntcd glycerides, t h c acids being interchnngcnble, nnd their ninountv arc dcpcndcnt 011 tho soiirccs and prolinbly on the ripcness of t*hc sccd.
(a) Thickcning 1,)-polynierisntion, without cliiinge in clicinicnl coinpositioii, occiii's rrlicn 1.licre iire nt least9 two p i r s of cloul~ly linkccl cnrbon ntonis in the niolccrilcs of tlic ncicls of tlic glyccridcs.
1. 7)
Dcforc polynicrisation occurs tlicrc is a shifting of tlic liiikngcs in. (.lie ~nolcci~lc, n i d , in tlic c:~w of tung oil, tlicrc is 50111e sliglit cviclcncc of ring fornintion. (-1) Tlic thickening is diie io polyincrisntion of 1,Iiu inisccl ~lyccriclcs, nncl tlic fiist sliigc is tlic forinnlion of n product iIlSOhllJk! in ncctonc. whi+ niriy I)c n doultlc iiiolcculc of linked glpccridcs in 1,lw cnnc of linscccl oil, OP n cpindriiplc-1i10lt!c11lc in ltoppysccci oil. ('5) Tlio cliniigc is dcpendcnt. on the tc~iii~~crnli~i~c, :riitl nn equi1il)riuin is cstnl)lislic~d wlicn 504;{, of tlic niotlificnlioii 11:is Im!n forniccl. (6) A t Iiiglicr teinpcraturcs tlic finnl stngc is tlic forinntion of n polynicr insoluble in light petrolci~n~ wliicli sccins to IE clctcrniiiictl i n linscctl oil by tlic linolcnic ricitl glyceride. 1~1scuas1os. tile opiwity in tiin:: oil vnrnirilics and nlso of t lic otlciisivc siiicll of tuiig oil ? llnd nny ili1lcrcnc:c Iwen ol,scrvccl in tho IAiaviour of cold-drnwii arid hot-drawn linseed oils ? Jir. Co.mmrtr, inquired ns to tlic ~iicttliod of m. i?. 11. A L ~O C R \rilnt \ ~n s tilo c:Ltlsc or distiriKiiisliing I~ctrvccii vtiryiiig snniplcs in rcl n 1' 1011 l o iodiiic vnlucs. Dr. J101ti1~r.r~ csplnincd Llitit wlieii lung oil WIIS esposcd to liglib it pnssiccl into nri isoiiieric riiodifitw Cion wliicli WLS vcry ccwily ositliscil to n \rliitc, insoluble substiincc. I t w i d tho forinntion of this inot1ific:itioii t r n d its subscqucnt rnpid osidntioii wliicli \*as csscntinlly tlic cniiw of the opncity ol wood oil varnishes. TIic difl'crcncc bctrrccn coldd r ~~\ o i i niid hot-dmwn linsccd pi1 woi11d IIC in ttlic ttriiount of niucilngc ~ircscnt. J. lie liiisccil oil iiiitl tlic wootl oil used conttrincd no rosiu. I n tlic conpulaLioii OC wood oil 1 y iiicni1.s of diiiictliyl sulplintc yrcut (::IPC must IJO ttrk(!ir in Iinndling Llic rcngcrit. Arcwliis oil Iind ~iob becn inwstigntccl, 111 the Iicsirlwoiiiidc tcsL for liiisecd oil the Iicsnbroino-rwicl oiight to IJC seprrrntcd niirl i1.s ~i~cltiiig point dctcriiiincd. In tliu dcl.cmiiintion of t.lic iodiiic values, all vnliics o l ~t ~i n c c l \r+crc coiii~~circd wit11 (I lilaiik iletcrniinntion iiiiide \riLli 11\iru olive oil f(,1+ tlic sniiie tirnc of cbont;ict with tlie \'ijs solution.
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