the case of pure oils we have found ‘a atereiee) of 5 at the: highest), 
happened to be a trifle higher, it was phe a result of ee gee 
and besides during the distillation a flocculent Eien Sou ae in n thé recstven, 4 
which otherwise is never the case. It was also remarkable, that the acid did not pass 3 
over so rapidly and easily as under normal conditions, so that the end point of the 
distillation was only reached with difficulty and the acid value Il was conser hy 
not to be estimated sharply. | — 
In order to obtain information as to the nature of the flock they were colic eat ¢ 
on a filter and dried. In the course of further testing it was found to be an acid, which 5 
melted at about 31° and had an acid value of about 236. Since we only had a trace © 
of the substance, and the small oil sample for the examination’ was used up, a a purifi- | 
cation of the acid was out of the question and we had to rest satisfied with this 
approximate verification. The numbers do not agree with any one of the known fatty 
acids, yet we shall hardly go wrong in the assumption that we had been dealing f 
with a somewhat impure lauric acid (melting point 43.6°, acid value 279. 7). Since | 3 
this does not form one of the components of lavender oil, it can only be regarded as. . 
an adulterant, which had been doubtlessly added in the form of ester, for the oil con- * 
tained practically no free acid. It cannot be said how much ester had been added, : 
since it was impossible to estimate the acid that had passed over apart from the others, — 
and also since the acid had apparently not been completely distilled over. Yet however — 
the observant analyst is at least in the position in general to recognize the adulteration ; 
The admixture is all the more remarkable, since the oil, as already mentioned, showed — 
normal constants and was comparatively poor in esters: — d150 0.8889, %» — 9°20’, acid — % 
value 0.9, ester value 72.3 = 25.3 per cent. ester, reckoned as linalyl acetate. It is seen 
from this how necessary it is to carry through the investigation in all its details, it one : 
wishes to be accurately informed of the purity or otherwise of an oil. 
We have been able to establish the same adulteration in two further lavender on 
which had been forwarded to us by various parties to pass an opinion on. We have 
no doubt that they originally come from the same French source as the sample we 
have just discussed; the one oil (II) indeed appears to have passed through one or 
more stages, for it was adulterated almost beyond recognition. Here are the constants: oh, 
I I 
% 
rH Chey a Name oath ses oe ACNE 0.8892 1.0275 ee 
Bape a Whe ae RUA era Hott +) 90g 
Solubility in 70 per cent. ieanot elated: sultan orate 1.5 vols. and more — 
Acie Valiies) ne20 ai Nae aie od Siege eke eS OS raga Ue: 
Ester valte:°s un ee GO Fs Rey Ay 2483 Aha 
Aoravaliteidh Ve oe : about 88.0 — about 80 , 2a 
Difference between oanneaaen | 
value and acid value. . . - ‘ about 12.2 
¢ 
about 168. a0 
our experience in the course of the years seats too low. 
