abstract only we were unable to test this method. 
‘that we had not to deal with a genuine natural product was strengthened by ‘the fact 
guaranteed pure oil, examined for comparison purposes, not a trace of paraffin was. = 
Centr. delle Gabelle 7 (1914), 89; Annali Chim. Appl. 8 (1915), 372. From Journ. ‘Soe 
Sunsested. 10 cc. of the oil to be tested are Treated with 40 8G: ‘of 10 4 
the mixture is reduced to a small volume, neutralized, sapoailied ae 
Raney and evaporated to the dry state. 
with acrolein vapours. As this publication was nt our disposal i in | the form. of as s 
Lemon oil. A sample of lemon oil supplied by a Hamburg firm and subr 
us for analysis from Berlin, was found to have been adulterated in a very ir 
manner. The oil had the following constants: dis0 0.8583; apo + 659 ap of the 
10 percent. of the distillate +-63°10', citral content (phenylhydrazine method) 3.4 per -ent 
evaporation residue 2.7 per cent. Generally speaking, all these properties. may. De : 
looked upon as normal, excepting the rotation which is abnormally high, and the ; 
content which is comparatively low. But though such deviations may occur in lemon 
oil, they are rare enough to justify such oils being treated with suspicion. Our suspicion 
that the evaporation residue showed, peculiar properties. which induced us to examine 
it more closely. By re-crystallization from alcohol a fine white crystalline substance 
was separated which melted at 44°, a closer investigation revealing it to be paraffin. 
As this body is unknown as a constituent of lemon oil and as in the residue of a 
to be found, it is evident that the oil under examination was at least considerably 
adulterated, if it was not altogether an artificial concoction, cleverly adjusted so as. to 
show the correct constants. The adulteration was no doubt the work of a skilled man and 
serves as a reminder that in chemical analysis even apparently unimportant divergences 
should not be overlooked. ‘ Pei. 
A sample of terpeneless lemon oil sent us from Vienna also proved to be an adulter- 
ated or artificial product. Nothing was tobe Said as ets its. eae, bee 
of geranyl acetate or terpinyl acetate was noticeable, whereas the fatty altlehatis 
are characteristic for terpeneless lemon oil, were conspicuous by their absence. . ae 
~ 
It would seem that optical rotation of lemon oil is altered but ees or at i 
box in partly: -filled, well- stoppered copper vessels. ‘Atier seven. years ‘id 
ad 
1) See Gildemeister und Lathan Die atherischen Ole, 2nd, ed., vol. Ill, p. 76. — % 
(1915), 851. — 8) Report October 1910, 61; April 1911, 149. — a6: Americ. Food. ds Chem. 
647. From the Perfum. Record 7@ (1916), 108. ey F ; 
a+ od 
