This section is from the book "A Treatise On Therapeutics, And Pharmacology Or Materia Medica Vol2", by George B. Wood. Also available from Amazon: Part 1 and Part 2.
Few agents are more speedy or powerful in producing excitement of the skin than electricity in its dynamic forms; and the excitement may be made sensational merely, or inflammatory, according to the method of application; the continuous galvanic current producing the latter effect especially, the interrupted current of induced electricity the former. Rubefaction of the surface produced by electricity may be employed for all the therapeutic purposes already referred to in the general observations upon the class of medicines now under consideration. For the modes of employing the remedy, the reader is referred to the article on Electricity as a diffusible stimulant (vol. i. pp. 501, 516, 523, etc.), also to the observations hereafter to be made upon electricity as a caustic agent, under the head of Escharotics.