47 
contained in eucalyptus leaves, as the latter are 
extensively in use for tinctures and infusions. 
H. Weber determined the solid chemical con- 
stituents of the leaves of eucalyptus globulus 
as : — 
I. An acid substance crystallizing in needle- 
like form. 
2. An acid resinous substance of bitter taste 
and yellow colour. 
3. Eucalyptic acid. 
4. Eucalyptine, a neutral cry stalli sable, bitter 
substance, on which latter the febrifugal virtue of 
the eucalyptus foliage seems mainly to depend, 
and which, for precise medical administration, it 
would be well to isolate. At all events, the 
antipyretic principle should be further studied 
from the point of chemistry. (See the writer’s 
English edition of Wittstein’s organic constitu- 
enti of plants, 1878). 
Mr. Th. Taylor gave, also, some attention to 
the chemical contents of eucalyptus leaves. 
(Report of the Department of Agriculture of 
Washington, 1876). 
The foliage of different eucalypts is, however, 
as variable in quality and quantity of its solid as 
of its oily constituents. The contributor of this 
article thus found that the leaves of eucalyptus 
leucoxylon contain in the fresh state about 5 
per cent, of eucalypto-tannin, equal to the large 
percentage of 10 in the dried leaves. (F. v. M., 
