It was no affectation upon my part to say that the prospect of my night’s adventure was an agreeable one. I had no pretence to greater physical courage than my neighbours, but familiarity with a subject robs it of those vague and undefined terrors which are the most appalling to the imaginative mind. The human brain is capable of only one strong emotion at a time, and if it be filled with curiosity or scientific enthusiasm, there is no room for fear. It is true that I had my uncle’s assurance that he had himself originally taken this point of view, but I reflected that the breakdown of his nervous system might be due to his forty years in India as much as to any psychical experiences which had befallen him. I at least was sound in nerve and brain, and it was with something of the pleasurable thrill of anticipation with which the sportsman takes his position beside the haunt of his game that I shut the laboratory door behind me, and partially undressing, lay down upon the rug-covered settee. It was not an ideal atmosphere for a bedroom. The air was heavy with many chemical odours, that of methylated spirit predominating. Nor were the decorations of my chamber very sedative. The odious line of glass jars with their relics of disease and suffering stretched in front of my very eyes. There was no blind to the window, and a three-quarter moon streamed its white light into the room, tracing a silver square with filigree lattices upon the opposite wall. When I had extinguished my candle this one bright patch in the midst of the general gloom had certainly an eerie and discomposing aspect. A rigid and absolute silence reigned throughout the old house, so that the low swish of the branches in the garden came softly and smoothly to my ears. It may have been the hypnotic lullaby of this gentle susurrus, or it may have been the result of my tiring day, but after many dozings and many efforts to regain my clearness of perception, I fell at last into a deep and dreamless sleep.