By applying the diene-synthese to samples of fresh oil from Aleurites montana, the relation diene-number = 1400 (ni5 -1.4681)was found. Also the relations bromometric iodine number = 925 (nt5 -1.3414), Wijs-lodinenumber = 1300 ( n i 5 -1.3W)e nf-n, = 0.25 (nt5 -1.4367) f 0.0003 and time of gelatination (282") = 71.4 -6/7. Diene-number + 0.3 Acid-number were determined. These formulas cannot be applied to old samples of t u g oil on account of the polymerisation.The polymerisation of tung oil decreases the diene-number, iodine-number and dispersion linear with the refraction.This makes it possible to determine the constants of an old oil In its original fresh condition.By applying the diene synthesis of D i e 1 s and A 1 d e r 1) to wood oil 2 ) it is possible to determine the compounds present with conjugated double bonds, quantitatively, good results being obtained by following the recommendations of E 1 1 i s and J o n e s, particularly the accelerated method by heating for one hour with a little iodine as catalyst.In the investigation of a large number of oils, pressed from seeds of Aleurites monfana, derived from different parts of Java, it was found that a linear relation exists between the diene number and the refractive index, provided one is dealing with fresh oils.Hence it is possible to calculate the diene number of the oil by means of the formula: diene number = 1400 ( n -1.4681 ).With 75 samples of oil a difference of about 0.2 was observed on the average between the experimental and calculated diene number, while the maximum deviation amounted to 0.6 in one case. Usually the (Java).

Das 0 1 \'on Aleurites trisperma besteht hauptsachlich aus den Glyceriden der Eldostearinsaure, Linolsiurc. Olsdure, Palinitinsaure und Stearinsaure. Im Geyensatz zu der Anyabe von J a m i e s o n und M c K i n n e y

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Bei unseren Untersuchungen iiber Diphenylchlorarsin und Diphenylarsinoxyd erwies sich eine schnelle und genaue Bestimmungsmethode dieser Verbindungen als wunschenswert. W i r haben daher einige Methoden nachgepriift und gelangten dabei zu einigen bemerkenswerten Ergebnissen.Diphenylchlorarsin wird wie bekannt sehr leicht durch Natronlauge zersetzt, unter Bildung des bis-Diphenylarsinoxyds nach der Gleichung : 2 (C,H& As C1 + 2 NaOH -[(C,H,), As],O + 2 NaC1-k H20. 490, 699 (1920).

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