. Journal. inal rape oil. Tin- fifth column of the table contains the results of ananalysis of commercial blown cotton-seed oil, and a similarchange in constitution is observable by blowing with air asiu rape oil. It will be noticed, however, that the molecularweight of the soluble volatile acids contained in blowncottou-seed oil is much higher than that of the productfront rape oil. The true means of distinguishing them is Table showing Results of Analysis oi Oils. No. l. Pur Rape Oil. No. 3. No. 4. No. 6. Partially Blown Blown Blown Blown Cotton Rape Oil Rape Oil RapeOi ml. prepared p
. Journal. inal rape oil. Tin- fifth column of the table contains the results of ananalysis of commercial blown cotton-seed oil, and a similarchange in constitution is observable by blowing with air asiu rape oil. It will be noticed, however, that the molecularweight of the soluble volatile acids contained in blowncottou-seed oil is much higher than that of the productfront rape oil. The true means of distinguishing them is Table showing Results of Analysis oi Oils. No. l. Pur Rape Oil. No. 3. No. 4. No. 6. Partially Blown Blown Blown Blown Cotton Rape Oil Rape Oil RapeOi ml. prepared prepared I oimnercial. Commercial from No. 1. llomXo. I. Sample. Sample. PureSperm (til. No. 7. Blown Sperm t>d prepared I nun No. ii. at IS50 C. (water at 155! - 1 I I Pet at L- K< ill neutralised absorption Specific tempi ra n Action Insoluble acids Per cent. s iluble non-volatile acids Soluble volatile acids \l .1, cular weight ol .. „ .. soluble non-volatile acids „ „ soluble volatile acids. 879-9rw ??:13-04 s-2 1 693 !!3-27 84-66 11 2307-1 1,1892.] THE JOURNAL OF THE SOCIETY OF CHEMICAL INDUSTRY. 507 to be found iu the large difference in alkali-neutralisingpower, as all the other data approach too close to eachother to provide any means of determining which oil isbeing tested. In making these comparisons it is apparentthat the oils must have reached the same state of oxidationbefore correct deductions can he made. Thus, a blownrape oil of a specific gravity of about 960 ought to becompared with a blown cotton-seed oil of about 96K. The only other point to which special reference may bomade is tin- largely increased power of developing heatwhen mixed with sulphuric acid, possessed by the Mownover the unblown rape and cotton-seed oils. This isexpressed as the Specific temperature reaction, for thedefinition of which term, and method of determination, seeour paper in this Journal for 1891,page 233. The increasein specific temperature reaction by oxidation of oils
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