It is better to begin ten days before the expected attack, for, in hay fever, as in all periodic diseases, prevention is better than cure, requires smaller doses, and is more certain. However, few patients are wise enough to anticipate trouble. Most patients apply for treatment when, literally, the disease is in full blast, and most of my observations have been made on the latter class. In case the disease has already begun, start with the same dose, ten drops. If not relieved in three days, increase the dose by five drops every third day up to thirty drops. If the symptoms should be relieved by the smaller dose, it is unnecessary to increase it. =Cure Or Palliation?= In regard to the permanence of the cure, most patients require it for several seasons. Some need it every season for many years. A few are permanently cured in one season. For further information about the plant, rosin weed, its preparation and use in medicine, the reader is referred to Chapter XIV. CHAPTER III _ICHTHYOL AND THE POINT IN THE NASO-PHARYNX THAT CONTROLS THE SYMPTOMS_ While the use of rosin-weed was discovered by my father, the value of ichthyol in the treatment of hay fever and the point in the naso-pharynx that controls the symptoms are discoveries of my own or, at least, I fondly think so. In current medical literature, I find no reference to it. In Merck's _History and Preparation of Ichthyol_, a summary of its use to 1913, ichthyol is advised in hypertrophic and atrophic rhinitis, but hay fever is not mentioned. Reference to recent books, as Coakley, Ballenger, Ivins, Bosworth, Kyle, Grayson, show no knowledge of the use of ichthyol in hay fever nor of the spot in the naso-pharynx that controls the symptoms. The point of the matter is this. In hay fever, the itching and redness of the eyes, nose, and throat are controlled from a sensitive point in the naso-pharynx. Local applications to this point will relieve almost instantly not only the itching of the throat but also the itching of the eyes and nose and all symptoms of the disease. In some cases such relief carried out for several seasons makes permanent cures.