- 58 - 
to the present a proof in support of this statement. We also beUeve, 
by the odour, that we have detected indol in neroli oil. Although 
we have observed with a brownish-red product, which had a pro- 
nounced indol-like odour, a colour-reaction with isatin and concen- 
trated sulphuric acid, which pointed to this, we have not been able to 
demonstrate the presence of indol by its combination with picric 
acid. The oil probably contains such a small quantity of this 
body which has such an intense odour, that the detection of it offers 
great difficulties. 
The foregoing examination has therefore shown, that in addition to 
the hitherto-known constituents, neroli oil also contains the following 
bodies: 1-pin ene, 1-camphene (?), dipentine, decylic aldehyde (?), an 
alcohol QoH^gO, probably 1-linalol, phenyl ethyl alcohol (free or as 
ester), d-terpineol (melting point 35°), phenyl acetic and benzoic acids. 
The method for the quantitative estimation of methyl anthra- 
nilate in essential oils, recommended by E. Erdmann^), which 
is based on the property of the ester of forming azo-dyestuffs, has 
been verified by A. Hesse and O. ZeitscheP). Their examination has 
proved that Erdmann's method is not sufficient for the quantitative 
estimation of this body in essential oils, but that it gives satisfactory 
results if the anthranilic acid ester is present substantially or in 
an acid solution. The last-named authors therefore believe that it is 
more correct to adhere to the method mentioned by themselves, and 
in cases where methyl anthranilate as well as methyl ester of methyl 
anthranilic acid are to be estimated, to combine the two methods. 
Oil of Neroli Portugal (Sweet orange -flowers). E. Theulier^) 
has published a short w^ork on the oil from the flowers of the sweet 
orange. The oil obtained by simple distillation, without cohobation, 
had a dark-yellow^ colour, and an odour not reminding of that of 
ordinary neroli oil. The specific gravity at 23^ was 0,860, the optical 
rotation 29^30', the ester-content 6,35 per cent. With 90 per cent 
alcohol the oil showed a silky cloudiness; in the cold, a paraffin of the 
melting point 55° separated out. The oil distilled between 160° and 
233^, and appeared to contain a considerable quantity of higher-boiling 
terpenes. Theulier succeeded in demonstrating the presence of 
d-camphene by means of the isoborneob melting at 212°, produced 
from it; of d-limonene, by the limonene tetrabromide melting at 105^; 
and of d-linalol by Dobner's citral-compound melting at 198,5° 
which was obtained by oxidation of the fraction coming under 
^) Berliner Berichte 35 (1902), 24. ■ 
2) Berliner Berichte 35 (1902), 2355. 
3) Bull. Soc. chim. III. 27 (1902),^ 278. 
