And then, while he was yet a student, there came to him a dream-adventure which he has no anxiety to repeat; he began, that is to say, to dream in sequence and thus to lead a double life—one of the day, one of the night—one that he had every reason to believe was the true one, another that he had no means of proving to be false. I should have said he studied, or was by way of studying, at Edinburgh College, which (it may be supposed) was how I came to know him. Well, in his dream-life, he passed a long day in the surgical theatre, his heart in his mouth, his teeth on edge, seeing monstrous malformations and the abhorred dexterity of surgeons. In a heavy, rainy, foggy evening he came forth into the South Bridge, turned up the High Street, and entered the door of a tall _land_, at the top of which he supposed himself to lodge. All night long, in his wet clothes, he climbed the stairs, stair after stair in endless series, and at every second flight a flaring lamp with a reflector. All night long, he brushed by single persons passing downward—beggarly women of the street, great, weary, muddy labourers, poor scarecrows of men, pale parodies of women—but all drowsy and weary like himself, and all single, and all brushing against him as they passed. In the end, out of a northern window, he would see day beginning to whiten over the Firth, give up the ascent, turn to descend, and in a breath be back again upon the streets, in his wet clothes, in the wet, haggard dawn, trudging to another day of monstrosities and operations. Time went quicker in the life of dreams, some seven hours (as near as he can guess) to one; and it went, besides, more intensely, so that the gloom of these fancied experiences clouded the day, and he had not shaken off their shadow ere it was time to lie down and to renew them. I cannot tell how long it was that he endured this discipline; but it was long enough to leave a great black blot upon his memory, long enough to send him, trembling for his reason, to the doors of a certain doctor; whereupon with a simple draught he was restored to the common lot of man.