Having finished the examination and found no gross lesion requiring surgical removal, the treatment must be decided. The easiest plan for both patient and physician is to give rosin-weed, as described in Chapter II. The most painful for the patient but often effective in severe cases is the application of ichthyol, as described in Chapter III. If the patient is systematic and will attend to it, the ichthyol may be replaced by the _frequent_ spraying with menthol and eucalyptol, as described in Chapter IV. The best treatment of all, but that which takes the most time of both patient and physician, is the use of electricity, as described in Chapter V. Consider the possible importance of diet in the case, as described in Chapter XIII. Finally, ponder on the nature of hay fever, as discussed in Chapters VI to X, and the advisability of using vaccines or pollen extracts, and you will have done your whole duty by your patient and by your art. CHAPTER II _ROSIN-WEED_ For many years the fluid extract of rosin-weed has been known in my family as a remedy for rose-cold and hay fever. This use of it was discovered by my father, Dr. Alexander H. Laidlaw, in the epizoötic days of 1872, when horses were dying by the thousands all over the United States and Canada. Though he knew it first as a horse medicine, its use seems to be forgotten in veterinary practice, for I find no mention of it in available veterinary books, old or new. In my father's practice this remedy acquired considerable fame, and I still receive a letter or two every summer from distant cities from some one who has heard of the miraculous medicine. For many years it was his intention to give this remedy to the world in proper form, supported by competent testimony; but, in a busy life, with many projects unfulfilled, this was never done. During my own professional life I have been interested in many things that seemed more important than hay fever and have not heretofore taken up the matter of publishing our experiences with the drug. Realizing that there were many hay fever victims both in this country and in Europe who might just as well be getting the relief that this drug would give them if they only knew about it, and having no desire to profit by my possession of the secret of this remedy, I made the announcement last summer, first to the American Institute of Homoeopathy and next to the United States Hay Fever Association. I announced it first to my old society, the Institute, believing that my friends there, who have known me many years, would credit my statements as made in good faith and give the drug a fair trial. =The Dose.= Beginning ten days before the expected attack, give ten drops of the fluid extract of rosin-weed in a little water four times daily, after meals and on retiring. To children, give five drops. If the symptoms of hay fever appear, increase the dose to twenty and even thirty drops and continue this dose through the entire hay fever season.