— 74 — 



not inconsiderably in excess of the limits of value of pure bergamot oils. 

 It was however impossible to carry out a more detailed examination of 

 this oil, or to identify the ester in question, owing to the insufficiency of 

 the sample submitted. 



The altogether abnormal constants of sample No. 7 at once showed it to 

 be adulterated, and even gave rise to the suspicion that it represented not so 

 much a grossly-adulterated oil as an altogether worthless artificial product. 



Sample No. 



di 5 o 



Evap. Residue 



Sap. v. of evap. res. . . 

 Sol. in 90 °/o alcohol . . . 



Acid v 



Ester v. after 1 h. sapon. 



with 10 cc. seminorm. 



sol 



Ester -content (calc. as 



linalyl acetate) 



Ester v. after 2 h. sapon. 



with 20 cc. seminorm. 



sol 



Ester v. after 1 h. sapon. 



with 10 cc. seminorm. 



sol. -f- 25 cc. alcohol . 



Difference 



Sap. v 



Acid v. II 



Difference 



Terpenyi acetate content, 

 about: 

 Esters of sparingly sol- 

 uble acids 



0,8967 

 -f-21<>12' 



6,5<>/o 



192,5 



0,5 vols. 



a. m. 



2,9 



0,8867 

 -f-19°14 r 



4,0 % 



182,1 

 0,3 vols, 

 a. m. 



1,6 



99,5 

 34,8% 



111,9 



87,5 



24,4 



102,0 



91,2 



10,8 



105,7 

 37,00/o 



114,1 



0,8833 

 -j-18°0' 

 5,0% 

 170,2 

 0,3 vols, 

 a. m. 

 1,5 



0,8853 

 +18°25' 

 6,4% 

 182,0 

 0,4 vols, 

 a. m. 

 2,2 



0,8833 

 -fl6°55' 



4,8% 



175,0 



0,3 vols. 



a. m. 



1,5 



96,9 J 101,8 I 95,0 



I i 



33,97o I 35,6% j 33,2% 



101,6 I 106,5 



97,7 ! 90,8 



16,4 j 10,8 



107,3 j 98,4 



101,0 j 90,9 



6,3 7,5 



14% 8% 4% 



97,1 



9,4 



104,0 



97,1 



6,9 



3,50/o 



98,7 



90,7 



8,0 



96,5 



89,8 



6,7 



3% 



Glycerol esters . 



Not demonstrable 

 Not demonstrable 



0,8795 

 + 230 16' 



4,8% 



221,7 



0,5 vols. 



a. m. 



1,2 



0,8781 

 f 540 40' 

 4,8% 

 332,4 



0,9 



102,9 j 76,0 



97,7 



5,2 



101,9 



89,6 



12,3 



suspect 



61,1 

 14,9 

 62,0 

 52,3 

 9,7 



7% 



0,8845 

 +16° 40' 

 5,6% 

 185,0 

 0,2 vols, 

 a. m. 

 1,8 



100,7 — ; 100,8 



35,2% j - 35,3% 



103,9 



97,5 



6,4 



102,6 



96,4 



6,2 



suspect 



not j not 

 present demonstr. jdemonstr. 



not 

 (demonstr. „ {about 1% 



Sample No. 8 contained about 1% glycerol ester and probably, in 

 addition thereto, a small quantity of terpinyi acetate. After having been 

 shaken four times with an equal volume of 50°/ alcohol (Report April 

 1911, 150) it was found that the weight had decreased down to 33,6% of 

 the original. Evaporation of the four solutions of the glycerol ester 

 and subsequent fractional distillation in vacuo yielded a few grms. of the^ 

 ester boiling between 125 and 130° (4 mm.), with the following constants: 

 diso 1,1564, a D ±0°, n D2 oo 1,44317, acid v. 2,8, ester v. 610,6, sol. in about 

 5 vols, water and more. Estimation of the constituents of the ester showed 

 about 39°/o glycerol and 64°/ acetic acid. 



In connection with the above we submit the constants of a few samples 

 of bergamot oil in which no foreign esters were detected, but of which 



