"My dear Monsieur Garfield, now that you are so frank with me I will do my utmost in the interests of both of you," declared the dear old Professor, as he rose and crossed to the window. "What you have told me interests me intensely. I see by your travels to Spain and the South that you are leaving no stone unturned to arrive at a true solution of the problem--and I will help you. Orosin is the least known and most dangerous drug that has ever been discovered in our modern civilization. Used with evil intent it is unsuspected and wellnigh undiscoverable, for the symptoms often resemble those of certain diseases of the brain. The person to whom the drug is administered either exhibits an exhilaration akin to undue excess of alcohol, or else the functions of the brain are entirely distorted, with a complete loss of memory or a chronic aberration of the brain." "That is the case of my friend Miss Tennison," I said. "Very well. I will see her and endeavour to do what I can to restore her," said the elegant old French savant. "But, remember, I hold out no hope. In all cases orosin destroys the brain. It seems to create a slow degeneracy of the cells which nobody yet can understand. We know the effect, but we cannot, up to the present, combat it. There are yet many things in human life of which the medical men are in as complete ignorance as those who study electricity and radio-frequencies. We try to do our best to the extent of our knowledge, my dear monsieur. And if you will bring Mademoiselle to me to-morrow at three o'clock I will try to make my diagnosis." I thanked him for his perfectly open declaration, and then I left. That he was the greatest living authority on the symptoms and effect of the mysterious drug orosin I felt confident. I only longed that he would take Gabrielle beneath his charge and endeavour to restore her brain to its normal function. Punctually at three o'clock next day I called with my beloved and her mother at the house embowered in roses and geraniums up on the hill above the broad Rhône river. We were ushered in by an old man-servant, silent and stately. The Professor quickly appeared, his sharp eyes upon the patient. "I wonder if you will allow me, Madame, to take your daughter into my consulting-room alone?" he asked in good English. "It will be best for me to question her without any other person being present." "Most certainly," Mrs. Tennison replied. Then, turning to Gabrielle, she said: "The Professor wants to put a few questions to you, dear. Will you go with him into the next room?" Gabrielle, pale-faced and tragic, looked at me strangely, and then meekly followed the old Professor into his consulting-room.