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With regard to the mother-plants of the South Australian cajeput 
oils, we are unfortunately unable to give any information. We regret 
this all the more, as the oils differ from those known up to the present. 
The properties may follow here: 
Cajeput oil, blanc. d^go = 0,8908; = -|- 8° 8'; soluble in 0,5 
and more volumes 90^0 alcohol. The colourless oil has a pepper-like 
odour, and probably contains cymol. 
Cajeput oil, vert, d^go^ 0,8727; aj) = -l- 32^40'; soluble in 
5 and more volumes 90 ^/q alcohol. The oil which was coloured blue 
by copper, reminds by its odour of amyl alcohol and cineol; the latter 
could be detected in the oil by means of the iodol-reaction. 
Cajeput oil, larges feuilles. di50 = 0,8854; aj)=-[-9°7'; 
soluble in 2,5 and more volumes 70 ^/q alcohol. The oil has a pale- 
green colour, and is characterised by a very pleasant odour, resembling 
coriander; it is therefore probable that the oil contains linalool. 
Essence de Bruyere. This oil, also originating from Australia, 
has a pleasant aromatic odour, a pale greenish-blue colour (traces of 
copper), and a specific gravity of 0,8587 at 15°; aD = -|-2°44'; 
soluble in 4,5 and more volumes 90 ^/q alcohol. We have not been 
able to learn anything with regard to the plant from which the oil is 
obtained. 
Oil from Erythroxylon monogynum. The oil distilled from 
the wood of Erythroxylon monogynum Roxb. in a yield of 2,56^/0, re- 
presents a sticky crystalline mass with a pleasant odour reminding of oil 
of guaiac wood. The specific gravity is less than i ; melting point = 42^ 
to 45°; acid number = 6,77; ester number = 1,56; ester number after 
acetylation = 131. Soluble in i volume 90^0 alcohol with slight 
cloudiness, which disappears when more alcohol is added. 
For the purpose of examining the crystallising body, the last runnings 
of the oil were first of all submitted to distillation in vacuo, and the 
portion passing over between 212° and 216^ (8 mm) was frozen out 
from the smallest possible quantity of petroleum ether. After sub- 
sequently recrystallising twice from petroleum ether, a compound of the 
melting point 117° to 118°, crystallising in brilliant needles, was obtained - 
analyses of which gave results corresponding to the formula CgoHggO: 
I. o, 1 064 gm. of the substance yielded 0,3 2 4 6 gm. C and o, i o 7 o gm. Hg O 
11.0,1206 „ „ „ „ „ 0,3672 „ CO2 „ 0,1206 „ H2O 
Found : Calculated for Cgo H32 O : 
1. II. 
C 83,2 83,0470 83,24% 
H 11,18 ii,ii7o ii,2i7o 
7 
