— 13 — 
Finally I employed Baeyer-Villiger's method. 
20 grams of the substance were dissolved in 20 grams amyl alcohol 
and 80 cc. ether added to this solution; it was then strongly cooled 
in ice, and bromine added in drops until the bromine-coloration remained. 
Thereupon the solution was poured into a crystallising dish and put 
away. Although the authors state that when the ether is evaporated 
the bromide is precipitated in granular crystals, I was only able after 
about a week to detect on the bottom of the dish some small white 
crystals which increased in quantity on prolonged standing. These 
were then collected, washed with ether, and recrystallised from alcohol. 
The melting point of this compound lay at 124° to 125°, and there- 
fore proved the identity with dipentene. 
Final observations. 
In this manner I was able to detect in "Shu-yu", and isolate from 
it, as ketone, camphor: as oxide, cineol; as phenol ethers, safrol and 
eugenol; as terpene, dipentene. The object I had in view of detect- 
ing pinene in the fractions which I had obtained, could unfortunately 
not be accomplished on account of loss caused by the method of 
examination. But as a matter of fact, the portion 195° to 202° con- 
tains a more or less large quantity of this body. If in this portion 
camphor and terpene formed a mixture, a gradual rise in the tempe- 
rature should become apparent after repeated distillation, (an occurrence 
which I was unable to observe), or other constituents should be present. 
For this reason I made experiments with reference to linalool, which 
were unsuccessful; this fraction showed in the polarisation -apparatus 
a dextrorotation of 4° 48' in a tube of 100 mm; specific gravity 
= 0,9056, at 15°. 
Although the study of "Shu-yu" with regard to its constituents 
is still incomplete, I was forced to discontinue the examination on 
account of lack of material. I hope, however, that other chemists 
will deal with this interesting subject, and I await their results. Finally, 
I would express my warmest thanks to Professor Shim oy am a for 
his friendly advice. 
Bay Oil. From the Director of the Botanical Gardens of Vic- 
toria (Cameroons) we received an oil distilled from the green leaves 
of Pimenta acris, which entirely resembles West Indian bay oil in 
its properties, as will be seen from the following data: d-^50 = 0,9753; 
a© = — 3^; phenol -content: 64 per cent.; soluble in 90 per cent, 
alcohol, at first clear, with opalescence if more than one volume alcohol 
is added; this opalescence remains even when the oil is strongly diluted. 
As the oil also possesses a pleasant, powerful aroma, it might possibly 
become a competitor of the West Indian distillate. Pimenta acris 
