X, A, 2 Gibbs: Modification of Ylang-Ylang Oil 103 



Table VII. — Constants of oils submitted by Jahrlinff. 



Sample 



No. 



Grade. 



1 j Extra 



2 j 1 a .. 



3 j Extra 



4 j 1 a._. 



5 ' Extra, 



6 ' Extra 



7 ; 1 a,._. 



8 1 a.__. 



9 ' la -._. 



10 : Extra. 



11 i 1 a_._. 



12 Extra 



13 la.... 



14 Extra. 



Ester 

 number. 



201.7 

 128.7 

 153.8 

 130.3 

 164.4 

 172.7 



129.9 



. 130. 



124.2 



157.3 



122.0 



148.2 



122.0 



157.3 



Index of 

 refrac- 

 tion 

 30 /D. 



Specific 



rotation 



30/ D. 



1. 4762 

 1. 4913 

 1. 4900 

 1. 4919 

 1. 4860 

 1.4850 



1. 4937 

 1. 4965 

 1. 4944 

 1. 4870 



1. 4938 

 1.4842 

 1. 4913 

 1. 4860 



— 6.70 

 —39. 50 

 —27. 50 

 —40. 63 

 —20. 08 

 —21. 76 

 -25. 34 

 —38. 73 

 —45. 95 

 —16.23 

 —41. 83 



- 25. 80 

 —38. 73 

 -14.12 



Specific 

 gravity 

 30°/ 30°. 



Soluble 

 in alcohol 



of— 



0. 9478 

 0. 9445 

 0. 9504 

 0. 9452 

 0.9564 

 0. 9579 

 0. 9472 

 0. 9450 

 0. 9469 

 0. 9612 

 0. 9467 

 0. 9493 

 0. 9435 

 0. 9489 



Pe )• cent. 

 i 80 

 j 90 

 j 80 

 j 90 

 80 

 I 80 

 90 

 90 

 90 

 80 

 90 

 80 

 90 

 80 



Of the 14 oils reported in Table VI, which are representative 

 of the oils received by the Bureau of Science for examination, 

 11 have ester numbers higher than 120, Schimmel & Co.'s max- 

 imum; 9 have indices of refraction less than 1.4910, their min- 

 imum index of refraction ; while all but two have specific rotation 

 less than the minimum given by this firm. 



The oils listed in Table VII show a similar superiority and 

 justify an extension of Bacon's table. All 14 have ester numbers 

 greater than 120, 7 have indices of refraction less than 1.4910, 

 and 8 have specific rotation with a greater negative rotation 

 than -37°. 



The average of the constants for the year 1914, from January 

 1 to July 1, shows this same superiority in all the constants 

 tabulated. 



After due consideration of all the above-mentioned facts I 

 believe Jahrling is justified in announcing an extension of the 

 table of constants, as given in Table IV, and that these constants 

 should be adopted as standard for classification. 



SUMMARY 



The exports in ylang-ylang for the last five years are given. 



An extension of the classification at present in use is proposed. 

 This extension is warranted on account of the large number of 

 superior-grade oils produced. 



One new test — solubility in alcohol — has been added as a con- 

 firmatory test. 



