102 



The PhUippbie Journal of Science 



191S 



Table V. — Constants of Schimmel & Co.' a beat oih. 



Ester number 

 Inde.x of refraction 

 Specific rotation 

 Specific weijrht 



T.J to 120 

 1.4910 to 1.5000 

 -37' to -57' 

 0.930 to 0.945 



Schimmel & Co. reject the solubility in alcohol as a test for 

 classification. I have found this test very useful as a confirm- 

 atory test, since it indicates the amount of sesquiterpenes present 

 in the oil ; therefore I have adopted it for use as a standard 

 for classification in this laboratory. This test consists in deter- 

 mining the lowest strength of aqueous alcohol which can be 

 mixed with the oil without cloudiness in the proportion of 2 of 

 oil to 1 of alcohol. Oils with constants superior to tho.se given 

 by Schimmel & Co. are common in the Philippine Islands. 



Table VI is a list of constants taken at random from the data 

 collected by the Bureau of Science on the oils examined from 

 January 1, 1913, to July 1, 1914. The table also gives the grade 

 of the oil, classified according to Jahrling's method. 



T.\BLE VI. — Constants of some samples of ylang-ylang oil examined by 



the Bureau of Science. 



Grade. 



Ester. 

 number. 



Index of 

 refrac- 

 tion. 



Specific 

 rotation. 



Specific 

 gravity. 



Extra 



150.73 

 133.50 

 112.70 

 139.06 

 115.20 

 136.90 

 154.90 

 141.50 

 136.20 

 133.10 

 154.70 

 61.30 

 13^^ 00 

 143.00 



1.4876 

 1.4920 

 1.4935 

 L4900 

 1.4975 

 1.4940 

 1.4890 

 L4835 

 1.4890 

 1.4905 

 1.4900 

 1.5040 

 1.4900 

 L4840 



-18.10 

 -25.90 

 -32.20 

 —24.40 

 -46.20 

 -31.80 

 -19.04 

 -23.80 

 -26.00 

 -23.60 

 —17.50 

 -51.40 

 —21. 72 

 —16.76 



O.SGM 

 0.9420 

 0.9349 

 0.9432 

 0.9256 

 0.9457 

 0.9619 

 0.92%: 

 0.9433 

 0.9410 

 0.9525 

 0.9127 

 0.9349 

 0.9417 



la . 



lb 



la 



lb — 



la 



Extra -. - 



la - - 



la 



la 



Extra 



2 



la 



1 a - 



ff 



In our classification we have placed the most emphasis on the 

 ester number as the determining factor, but have been influenced 

 by the other constants. 



Doctor Jahrling, of Santos and Jahrling, has very kindly 

 furnished us with a number of samples of oils from his labo- 

 ratory. The constants of these oils have been determined by the 

 Bureau of Science and are given in Table VII. 



