128 



BACON. 



oils were characterized bj' a low refractive index, low optical activity, and 

 higli ester numbers. I have continued the investigation on this season's 

 distillates of this oil and find exactly the same series of regularities. 

 Acetyl numbers have also been made on these oils, and it will be noted 

 that first-grade ylang-ylang oils are characterized by high acetyl numbers 

 as compared with the second-grade' oils. The actual determination of 

 these numbers was made by the method of Zerewitinoff ^° and the results 

 calculated to the visual definition of acetyl numlier, namely, saponifica- 

 tion number of 1 gram of oil after acetylation. The numbers obtained 

 by this method are from 15 to 20 per cent higher than those given bv' the 

 standard method, due no doubt to the well-known behavior of alcohols 

 like linalool and geraniol toward acetic anhydride. 



Table III. — First-grade ylang-ylang oils. 



No. 



^,30° 



,30° 



Specific 

 gravity, 



30° 



4° 



Ester 

 number. 



Acetyl 

 number. 



20 



1.4944 



Der/rees. 

 -24.3 



0.943 



119 



203 



24d 



1.4863 



—32.5 



0. 915 



100 



177 



48 



1. 4880 



-42.5 



0.910 



90 



154 



49 



1. 4935 



-35.2 



0.930 



108 



187 



53 



1. 4920 



-31.0 



0.92 



106 



180 



27 



1.4872 



-40.0 



0.918 



109 



188 



28 



1.4877 



-44.8 



0.914 



106 



183 



29 



1.4882 



-46.6 



0.913 



102 



196 



30 



1. 4897 



-43.1 



0.922 



307 



189 



31 



1.4868 



—44.3 



0.916 



107 



192 



32 



1. 4870 



-44. 6 



0.917 



106 



181 



33 



1.4892 



-50.2 



0. 915 



102 



182 



34 



1.4880 



—51.8 



0.908 



92 



147 



35 



1.4898 



-43.0 



0.931 



129 



214 



51 



1.4860 



-22.0 



0.934 



126 



202 



52 



1.4860 



-31.0 



0.929 



105 



182 



55 



1. 4923 



-50.2 



0.919 



97 



177 



56 



1.4921 



-.50.3 



0.919 



97 



174 



57 



1.4924 



-50.2 



0.918 



98 



179 



58 



1.4921 



-50.3 



0.919 



96 



. 172 



59 



1.4921 



-50.0 



0.917 



96 



175 



60 



1. 4924 



-50.2 



0.918 



98 



178 



61 



1. 4922 



-60.1 



0.918 



98 



178 



62 



1.4922 



—50. 



0.917 



97 



176 



63 



1.4923 



-60.0 



0.919 



97 



175 



64 



1.4921 



-50.3 



0.918 



97 



176 



1 



1.4885 



-40.0 



0.917 



102 



182 



2 



1. 4880 



-40.0 



0.910 



92 



161 



3 



1.4880 



-36.5 



0.924 



118 



201 



4 



1.4860 



-34.0 



0.922 



120 



209 



' 



1.4910 



-43.0 



0.932 



100 



178 



Samples 55 to 64 inclusive represent ten distillations made in the same day, 

 three stills and the same lot of mixed flowers. 



'Ber. d. deutschen chem. Ges. (1901), 40, 2023. 



