PHILIPPINE TERPENES AND ESSENTIAL OILS, IV. 265 



A determination of the molecular weight was made by the cryoscopic 

 method. Solvent 12.67 grams benzene. 



Freezing Substance Molecular 



point. (grams). weight. 



3.790 



I 3.706 0.0692 296 



II 3.600 0.1563 298 



A semicabazone, crystallizing in white needles and melting at 205° to 206° 

 with decomposition, and a phenylhydrazone, which separates in white leaflets, 

 in appearance much like benzhydrol and which melts with decomposition at 153° 

 to 155°, were obtained from the original crystalline substance. The phenylhy- 

 drazone is only very moderately soluble in ether or petroleum ether, hot or 

 cold ; it is soluble in boiling benzene, nearly insoluble in cold ; readily soluble in 

 hot or cold alcohol, chloroform, or acetone. 



The original ketone or aldehyde from champaca, with concentrated sulphuric 

 acid gives a deep red colored substance, soluble in water to give a red solution. The 

 determination of methoxy groups by Zeisel's method gave a negative result. The 

 saponification of the substance with alcoholic potassium hydroxide showed that 

 if the formula of C 1 ,.Ho„0 3 is assumed, then two molecules of potassium hydroxide 

 are used by one molecule of the substance. However, it does not appear as if 

 this substance were an ester, because it gives several products on treatment 

 with alcoholic potash, of which neutral substances form only a very small 

 proportion. The body completely dissolves in alcoholic sulphuric acid with a 

 red color and with the odor of ethyl acetate. Acetic acid is one of the products 

 when it is oxidized with dilute potassium bichromate and sulphuric acid. 



The study of this substance is being continued. 



OTL OF YLANG-YLANG. 



A number of oils of ylang-ylang have been analyzed during the past 

 year, and the results prove my statement of three years ago still to hold 

 good, that the quality of ylang-ylang oil can be judged with fair ac- 

 curacy by a few simple analytical constants. The Manila oils which 

 I examined during the past year were rather better than in previous 

 years, due to strong competition of Eeunion oils, to better distillation 

 methods in the Philippines, and to a low price for the flowers. The 

 ylang-ylang flowers sold as 7 centavos (3.5 cents United States currency) 

 per kilo during this past season, as compared to about 40 to 50 centavos 

 (20 to 25 cents United States currency) three years ago. This per- 

 mitted the use during the past season of better flowers for distillation, 

 and oils having ester numbers of from 130 to 150 were common. 



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