— 63 



examination of pure oils should 

 difference must be regarded as 



show a higher figure, oils with a greater 

 suspect or adulterated. 



Acid 

 No. 



10 

 11 



Bergamot oil 



12 Diethyl succinate 



13 Tri ethyl citrate 



14 Diethyl oxalate 



Bergamot oil after adding 



15 1% Diethyl succinate 



16 2°/o 



17 3<7o 



18 4»/o 



19 5<7o 



20 l°/o Triethyl citrate . 



21 2o/o „ . 



22 1% Diethyl oxalate . 



23 2<>/o „ . 



24 2°/o Glyceryl triacetate 



25 4% Terpinyl acetate 



Ester 

 No. 



Sap. 



No. 



1,6 

 1,6 

 2,0 

 2,3 

 2,4 

 2,3 

 2,1 

 2,0 

 2,0 

 2,0 

 2,8 



of the Oil 



88,7 



90,2 

 101,1 

 112,3 

 100,0 



96,1 



98,3 



98,2 

 103,9 

 102,4 

 103,9 



0,8 602,6 



2,1 

 2,1 

 2,1 

 2,1 

 2,1 

 2,1 

 2,1 



2,1 

 2,4 



103,5 

 109,9 

 116,2 

 121,7 

 127,6 

 103,4 

 109,1 



111,2 

 103,2 



90,3 

 91,8 

 103,1 

 114,6 

 102,4 

 98,4 

 100,4 

 100,2 

 105,9 

 104,4 

 106,7 

 638,4 

 603,4 

 753,0 



105,6 

 112,0 

 118,3 

 123,8 

 129,7 

 105,5 

 111,2 

 106,6 

 113,3 

 113,3 

 105,6 



Sap. No. 



II of 

 the Oil 

 84,3 

 86,6 

 97,0 

 107,7 

 95,7 

 91,8 

 95,1 

 90,8 

 91,8 

 87,6 

 89,9 



7,3 



7,0 



7,2 



94,1 

 93,1 



92,8 

 91,8 

 91,5 

 94,1 

 92,8 

 94,7 

 92,5 

 108,7 

 100,0 



Diff. 



6,0 



5,2 



6,1 



6,9 



6,7 



6,6 



5,3 



9,4 



14,1 



16,8 



16,8 



631,1 



596,4 



745,8 



11,5 

 18,9 

 25,5 

 32,0 

 38,2 

 11,4 

 18,4 

 11,9 

 20,8 

 4,6 

 5,6 



In the case of the pure esters (Nos. 12 to 14) here examined the 

 difference between the two values was from 596,4 to 745,8. The addition 

 of such esters to oil of bergamot must therefore correspondingly increase 

 the difference of both numbers of the adulterated oil (Nos. 15 to 23 of 

 the table). 



Nos. 24 and 25 show that adulteration with the esters of the first 

 group cannot be detected by distilling the acids, because in these cases 

 the difference lies of course within the limits determined for pure oils. 



Nos. 10 and 11 in the table are the two oils referred to above (p. 56) 

 as having been adulterated with triethyl citrate; the oils being shown 

 by determining the saponification number of the residue of evaporation 



