The doctor, who was easily the most musical of the four men, sang in a cheerful baritone: "The owl and the pussy-cat went to sea In a beautiful, pea-green boat." The geologist, who had held down the lower end of a quartet in his university days, growled an accompaniment under his breath as he blithely peeled the potatoes. Occasionally a high-pitched note or two came from the direction of the engineer; he could not spare much wind while clambering about the machinery, oil-can in hand. The architect, alone, ignored the famous tune. "What I can't understand, Smith," he insisted, "is how you draw the electricity from the ether into this car without blasting us all to cinders." The engineer squinted through an opal glass shutter into one of the tunnels, through which the anti-gravitation current was pouring. "If you didn't know any more about buildings than you do about machinery, Jackson," he grunted, because of his squatting position, "I'd hate to live in one of your houses!" The architect smiled grimly. "You're living in one of 'em right now, Smith," said he; "that is, if you call this car a house." Smith straightened up. He was an unimportant-looking man, of medium height and build, and bearing a mild, good-humored expression.