"Of course, madam, with your permission," he answered. "It is a complex case. When we have solved it we shall then know how to treat the young lady." "And how do you intend to begin?" I inquired, raising myself, not without considerable difficulty. "By going into the room alone," he answered briefly. "You, too, will risk your life?" I exclaimed. "Is it wise?" "Research is always wisdom," he responded. Then, finding that I was recovering rapidly from the seizure, he gave me some technical direction how to treat him in case he lost consciousness. He arranged the tiny syringe, and the various drugs and tabloids, upon the hall table, and then, with a final examination of them, he opened the door of the fatal room and entered, leaving us standing together on the threshold. Walking to the window he looked out, afterwards making several tours of the room in search of its secret. He, however, found nothing. The air was pure as London air can be on a summer's night, and, as far as either of us could discern, there was nothing unusual in the department. The door swung to halfway, and we heard him growling and grunting within. He remained in the room for perhaps five minutes, then emerged. Scarcely, however, had he crossed the threshold when he lifted his left arm suddenly, crying-- "Ach, Gott! I am seized. The injection--quick!" His fleshy face went pale, and I saw by its contortions that the left side had become paralysed. But with a quick movement I pushed up his coat-sleeve, and ran the needle beneath the skin. His teeth were closed tightly as he watched me. "It is almost unaccountable," he gasped in an awed voice, when I had withdrawn the needle after the injection. "I was cold as ice--just as though my legs were in a refrigerator!" "Your feet are benumbed?" I said. "Yes," he responded. "The sensation is just exactly as you have described it. Like the touch of an icy hand." I felt his pulse; it was intermittent and feeble. I told him so. "Look at your watch, and in three minutes give me the second injection. There's ether there in the larger bottle." I glanced at the time, and, holding my watch in my hand, waited until the three minutes had passed. We were silent, all three of us, until I took up a piece of cotton wool, and, saturating it with ether, nibbed it carefully on the flesh. Then I gave him the second injection. "Good!" he said approvingly. "It acts marvellously. I shall be better in a few moments. Did you feel your head reeling and your strength failing?" I responded in the affirmative. "And so did I," he answered. "The seizure is sharp and sudden, the brain becoming paralysed. That is the condition of the young lady: paralysis of the brain and heart, coma and collapse." "But the cause?" I asked. He was pale as death, yet he took no notice of his own condition.