166 THE CHEMISTRY OF ESSENTIAL OILS
of external appearances in the living states, the test can readily be
accomplished by shaving small pieces from the sapwood portion—parti-
cularly the root—of the two trees, and judging from their inherent odour.
This test has incidentally proved to be the most reliable method of detect-
ing the difference between the two. A simpler method, however, is the
examination of the leaves. The leaves of the Sho-Gyu tree have a