Another disadvantage to the patient and, sometimes, to the doctor, too, is that it requires the patient to come to the doctor every day for the application, though Dr. Hollister tells me that he had one patient who learned to apply the ichthyol to her own naso-pharynx and, what is more wonderful still, kept up the treatment long enough to get well.
— from The Treatment of Hay Fever by rosin-weed, ichthyol and faradic electricity With a discussion of the old theory of gout and the new theory of anaphylaxis by George Frederick Laidlaw