After the views which have been submitted in the progress of the present
inquiry, it is evident, that the _form_ in which a remedy is
administered may exert some influence upon its medicinal effects; for
additional proofs of this fact, and for more particular directions, see
_Decocta_, _Infusa_, _Tincturæ_, _Misturæ_, _Pilulæ_, _Pulveres_, &c.
When a substance, or a combination of substances, requires the addition
of some other one, for the purpose of imparting a convenient, agreeable,
or efficacious form, _a vehicle should always be selected, whose effects
will be likely to correspond with the intention of the other
ingredients_. This precept may be exemplified by a reference to _Form.
80, 134_, and others, the _key-letters_ of which announce the _modus
operandi_ of their respective _vehicles_.