"The Yunani physicians, in specifying the different degrees of virtue,
or power of their medicines, include in the
"First Degree.--All those whose effects are not felt in common doses.
"Second Ditto.--Such medicines as have perceptible effects; but in
a moderate degree.
"Third Ditto.--Those of greater power, the exhibition of which must
be conducted with caution.
"Fourth Ditto.--All poisons or medicines of any deleterious
properties."