_The filings of Tin._
The anthelmintic properties of Tin have been explained by three
different hypotheses, viz. 1. _That it acts mechanically by dislodging
the mucus from the intestines_; if this be true, it is difficult to
explain the fact of its activity being increased by pulverization. 2.
_That its efficacy depends upon the presence of arsenic_; if so, why
should the _purest_ specimens act with equal efficacy?[652] 3. _That it
operates by generating hydrogen gas in the intestinal canal:_ it has
been observed that this opinion is rendered probable by the fact, that
sulphur increases its powers.[653] Dose, ʒj or ʒji, mixed with honey,
treacle or conserve, and exhibited for several successive mornings, a
purgative medicine being occasionally interposed, (see _Form. 150_.) The
use of this remedy however is entirely superseded by the more
efficacious exhibition of oil of turpentine.