— II — 
power -|- 3 1^ 25' (lOO mm tube). I suspected in it the presence of 
pinene. 
The nitroso chloride produced by Wallach's method melted at 
103°, in agreement with the rnelting point indicated by Wall a ch for 
pinene nitroso chloride. But as pinene cannot be detected simply by 
the nitroso chloride, it is necessary to produce also other derivatives 
from it. For this purpose the nitrol piperidide appeared to me the 
most suitable, and I produced this also according to Wallach. It 
melted at 118° to 119^, the melting point of pinene nitrol piperidide. 
From this I was able to conclude that the dextrorotatory pinene is 
present in shu-yu. 
III. Detection of a new terpene alcohol — apopinol. 
The portion boiling at 195° to 202° is present in shu-yu in large 
quantity, and consists of one third of the entire oil. In my last report 
I stated that I was not at that time able to give more exact details respecting 
that portion, and that there might possibly be an alcohol, linalool, in 
question. I am now able to give further information on the subject. 
From the above portion I distilled off another portion of the boiling 
point 197*^ to 199°, which had the following constants: 
specific gravity (pycnometer) : 0,8942° at 18° 
opt. rotatory power: -}-6°4' in 100 mm tube. 
(In the description given in the previous report there are some 
errors; the present data are therefore more correct) 
This substance is a colourless and transparent liquid, with an odour 
typical to shu-yu. Elementary analysis showed a body QoH^gO. 
Oxidation of the suspected alcohol with bichromate and sulphuric 
acid, according to the usual method, led to an oil which combined 
with a solution of sodium bisulphite, with formation of a crystalline 
body. The oil liberated from the addition-product boiled at 130° to 135° 
(55 mm pressure), and had the specific gravity 0,8942 (17°). Elementary 
analysis led to the formula C^oHjgO. The probability that it was here 
a question of citral, was confirmed by the fact that, when 10 grams 
of the substance to be examined was boiled with pyruvic acid and 
naphthylamine according to Dobner, there was obtained a condensation- 
product of the melting point 200° to 202° (Dobner 197°, Gilde- 
meister 200° and higher). Other methods for detecting citral, such 
as formation of the semicarbazone or of the condensation-product with 
cyanacetic acid, were not applied. 
Naming the substance under examination. 
It follows from the above examinations and the subsequent reactions, 
that it was here a question of a terpene alcohol, which on oxidation 
yields citral, as for example linalool. But in spite of the similarity in 
