- 83 - 
(i5°); optical rotation -[-2° 57'; acid number o; saponification number 
1 1,1, after acetylation 53,83; index of refraction njy 1,48229; soluble 
in 2Y2 volumes 70 pier cent, and in 0,7 volume 80 per cent alcohol. 
The oil distilled between 162 and 234°. 
From the 75 g oil obtained, 4.^/2 g of a fraction boiling at 162 
to 182° were isolated, whose high rotatory power (in a 20 mm 
tube = — 10^34') pointed to limonene. As a matter of fact it 
yielded on brominating a crystalline product, of which the melting 
point, after repeated recrystalHsation, was found at 104°. This proves 
the presence of limonene. The principal fraction of the oil, boiling 
at 210 to 223°, which amounted to 30 g, had a pronounced odour 
of pulegone; its specific gravity was 0,9279, the optical rotation 
-|-2 0^2i^ From the physical properties of this fraction it was con- 
cluded that it contained pulegone. The oxime obtained from it by 
Wallach's method melted within 85 to 119°, which pointed to a 
mixture of two oximes. After repeated recrystalHsation from dilute 
alcohol a body was obtained melting at 114 to 116^. 
But the absolutely certain proof of the presence of pulegone was 
found in the oxime containing water, which melted at 157°; this was 
obtained by Beckmann and Pleissner's method from the fraction 
of the boiling point 223 to 234°. 
Finally we succeeded in detecting menthone (by its semicarbazone 
melting at 180 to 181^) in a fraction boiling at 205 to 215°. 
The oil consists chiefly of pulegone and menthone; the content 
of limonene is but small. 
Oil of Mandarin leaves. In our Report of April last we 
mentioned an oil designated as ''petitgrain mandarinier", originating 
from the South of France, which had clearly been distilled from the 
leaves and the twigs carrying unripe fruit, of the mandarin tree. We 
are indebted to the kindness of Mr. Pablo Journet of Carcagente, 
for a sample of a similar oil, distilled only from the leaves of the 
mandarin tree. This gentleman obtained from 300 to 350 kilos selected 
leaves about i kilo oil, which during the distillation separated into t\^'o 
portions, one sinking in water, and. the other of less specific gravit}^ 
The sample sent to us was an average sample of the whole 
distillate. The oil has a yellowish colour, with a strong blue fluores- 
cence, and refracts the light very strongly; its odour is somewhat like 
that of neroli, yet differing from the latter in a marked degree. Its 
specific gravity was found to be 1,0142, at 15°, and the rotatory 
power -{-7^46'. It dissolves in 6 to 6,5 volumes 80 per cent alcohol, 
and consequently does not show any material difference in its physical 
properties from the oil designated as petitgrain mandarinier. Like the 
latter, it is very faintly acid, and has a very considerable ester- content 
6* 
