Fixed oils were separated from each part. These
were not identical; two were fluid at ordinary temperature, and two
were solid. Their melting and solidifying points were not the same.
This difference in the physical character and chemical reaction of
these fixed oils may be due to the presence of free fatty acid and
glycerides in varying proportions in the four parts of the plants. It
is of interest to note that, in the subterranean part of the _Yucca_,
the oil extracted from the bark is solid at the ordinary temperature;
from the wood it was of a less solid consistency; while the yellow
base of the leaf contained an oil quite soft, and in the green leaf
the oil is almost fluid.
Two new resins were extracted from the yellow and green parts of the
leaf. It was proposed to name them _yuccal_ and _pyrophaeal_ An
examination of the contents of each extract showed a different
quantitative and qualitative result.
Saponin was found in all parts of the plant.
Many of the above facts have been collected from the investigations of
others. I have introduced these statements, selected from a mass of
material, as evidences in favor of the view stated at the beginning of
this paper.[41] My own study has been directed toward the discovery of
saponin in those plants where it was presumably to be found.
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