Commercial notes and scientific information. 



61 



to sample No. 15. Here we were able to detect the presence of a little spirit, together 

 with a few per cent, of glyceryl acetate, a condition which would scarcely be looked 

 for in the case of an oil of lemon, because there the addition of an artificial ester 

 must in any case be considered as serving no object. Nevertheless it is possible that 

 here the effect of the adulteration was cunningly calculated, for, strangely enough, the 

 constants of the original sample were normal, and it was only after the oil had been 

 shaken out with water that any abnormality was observable, for then it was found that 

 the rotation of the initial 10 p. c. was somewhat in excess of that of the original oil, 

 whereas normally it is less by several degrees; moreover, the sp. gr. had fallen and 

 the rotation had increased. This peculiar behaviour led us to investigate the oil more 

 closely, when, as already stated, it was found to contain spirit and glyceryl acetate, 

 both of which were recovered as such. 



No. 



diso 



«D20° 



- 



of the initial 



Citral 

 (est. w. 

 phenyl- 



F 



Evapora- 

 tion- 



Sap v. 



of 

 evap. 



Adulterant 









10 p. c. of oil 



hydr.) 



residue 



res. 





1 



0,8604 



+ 49° 25' 



+ 40° 



3,2 o/o 



2,4 o/o 



— ! 





2 



0,8622 



+ 40° 15' 



+ 27° 50' 



3,0 °/o 



— 



— 





3 



0,8612 



+ 50°9' 



+ 42° 20' 



3,8 °/o 



2,4o/o 



— 



Turpentine oil. 



4 



0,8612 



-j-52°15 r 



+ 49° 10' 



2,8 o/o 



1,8% 



— 





5 



0,8604 



+5i° ir 



+ 46° 4' 



2,7 °/o 



2,0% 



— 





6 



0,8581 



+ 51°5' 



+ 52° 18' 



— 



13,8 0/0 



25,1 



Mineral oil. 



7 

 8 



0,8617 

 0,8676 



+ 44°ir 



+ 7° 



+ 41° 

 — 2° 48' 



1,5 °/o 



12,0 °/o 

 50,4 % 



44,8 | 



2 g r [Mineral oil and tur- 



» |f npnfinp oil 



9 



0,8690 



+ 5° 40' 



+ 0°8' 



— 



ca.50°/o 



10,8 



' 



10 



0,8524 



+ 57° 



— 



— 



— 



— ! 



Spirit (about 6 p.c). 



10a 1 ) 



0,8565 



+ 61° 40' 



— 



— 



— 



— 





11 



0,8525 



+ 56° IT 



— 



— 



2,3o/o 



— 



Spirit (about 6 p.c). 



11a 1 ) 



0,8562 



+ 60° 10' 



+ 57° 46' 



— 



— 



— 





12 



0,8542 



+ 63° 34' 



+ 58° 42' 



2,0 °/o 



3,2% 



- 1 



probably lemon oil 

 terpenes. 



13 



0,8543 



+ 83° 44' 



+ 76° 52' 



— 



5,6 °/o 



- ! 



Carvene or orange 



14 



0,8583 



+ 94° 26' 



+ 93° 22' 



1,3 °/o 



2,2 °/o 



- | 



oil terpenes. 



15 



0,8599 



+ 59° 



+ 55° 44' 



— 



2,2o/o 



- 



Spirit and glyceryl 

 acetate. 



15a 1 ) 



| 0,8590 



+ 59° 54' 



+ 60° 10' 



— 



— 



— 



0,856 mostly 



bis between 



0,861 +57 a +61° 



Limits of value of good commercial oils. 



about 2,1 

 4 to to 



up to 6 p. c. 

 less than a D 

 of original oil 



gener- 

 I ally 

 I 150 to 

 4 % ! 220 



On a disease of Citrus-plants see p. 133. 



Estragon Oil. We once more beg to recommend the exquisite distillate prepared from 

 herb grown here in Miltitz. We are of opinion that this oil, which is so extremely useful 

 for almost all alimentary purposes, is far from being as much esteemed as it deserves. 



l ) After shaking out with water. 



