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.
The subdivisions of these are also ultimate classes, and are as follows:
2. Epispastics, producing blisters; and
3. Escharotics, destroying the life of the part, and producing a slough.
3. Local Remedies acting Mechanically.
These include, besides the various measures enumerated under the head of "Mechanical Influence" (page 53), the following classes of medicines:
2. Emollients, which soften and relax;
3. Diluents, which dilute the fluids of the body; and
4. Protective8, which operate by covering the surface, and preventing the contact of the air.