(seq. 443)

436

Materia Medica

Siallaggues

those taken internally and produce the same effect on the salivary
glands.

Pellitory of Spain. This is used in tooth
ache and is the most powerfull of the sialogogues apply’d to the nose
in the shape of snuff it induces sneezing, tobacco is a sialagogue
as we observe in chewing, the master Wort acts in the same way, the
root of Horse Radish is mentioned by Dr Cullen as belonging to this
class, camphor produces a flow of saliva and by this means frequently
cures the tooth ache.

Zanthoxylem or American Tooth Ache Tree. A native of Pennsylvania
and is perhaps one of the most powerfull of this class, its power resides in
the bark and leaves, this has been used in syphalis. I have been
employ’d it beneficial in plague &c.

Senaca. Is an active article
of this class, if the root be chewed for a few minutes it produces a hot
and copious discharge of saliva, this I immagine would be the most
effectual of the external sialogogues, the next article we are to treat of
and the only one of the class is used both internally and externally.

Mercury. I shall pass over the natural history of this article
or Metalic Body, this is the most powerfull article in the Materia Medica.
I proceed to lay before you such observations as I conceive are most suited
to the subject of the Materia Medica, pure running mercury is destitute