The four classes comprehended under this first division, are NARCOTICS,
ANTISPASMODICS, TONICS, and ASTRINGENTS.
Although these remedies differ very essentially in the degree and
permanence of their action, as well as in the character of their
apparent effects, yet, as it is conceived that their _primary_ operation
is stimulant, they are considered as possessing sufficient general
similitude to sanction their arrangement under one comprehensive
division.