This section is from the book "A Treatise On Therapeutics, And Pharmacology Or Materia Medica Vol1", by George B. Wood. Also available from Amazon: Part 1 and Part 2.
Medicines have hitherto been considered in relation, not so much to their application to the cure of disease, as to their modes of affecting the system in health. It now remains to consider them more especially in the former capacity; and, in doing this, it will be convenient to treat first of the several modes in which they may operate in the cure of disease, secondly of the forms in which they may be applied, and thirdly of the parts through which, and the means by which they may be introduced into the system. The remarks which follow apply not only to medicines strictly so called, but to all other remedies.