140 HENRY G. SMITH. 
material is present on the surface of the green leaves of 
E. corymbosa and like species, yet, there is no signs of it 
upon the dull green leaves themselves, and it was only 
discovered on these by the systematic effort to locate the 
alteration product of the caoutchouc. 
From 1000 grams of fresh young growth leaves of EH. 
cinerea, steeped in ether for five minutes, 10 grams of solids 
were obtained, equal to 1%. This was finely powdered and 
extracted by petroleum ether (boiling 45—50° C.) in a 
Soxhlet for two days. The petroleum ether was distilled 
off and the wax evaporated to dryness. It was then boiled 
with alcohol until no more was extracted. The wax which 
separated on cooling was collected and melted into a cake 
by means of hot water. The total amount of wax was 3°55 
grams, equal to 0°355%. It was identical with that obtained 
from HK. corymbosa. It is thus evident that the pulverulent 
appearance of the young leaves of certain EKucalypts is due 
to the presence of the wax, and the absence of sufficient 
Wax in the coating accounts for the want of this pulverulent 
appearance on the leaves of E. corymbosa and like species. 
I would like to reserve to myself the chemical investigation 
of this wax, together withits accompanying white powdery 
resinous-like substance. 
The Caoutchouc.—lor the determination of the elastic 
substance, the material of EK. corymbosa was taken, as it 
was more robust and apparently contained more “‘rubber,”’ 
but similar results were obtained with A. lanceolata, and 
the white powder from the leaves melted at the same 
temperature. A. intermedia also contains similar material. 
Two extractions with ether in the cold, each of 15 hours 
duration, appeared to entirely remove all the wax together 
With its associated white powder. 500 grams of the buds 
and young leaves were taken. As soon as the ether had 
evaporated, the material was treated with chloroform and 
