Obviously, Millner’s original conception of his employer’s character had suffered extensive modification; but no final outline had replaced the first conjectural image. The two years spent in Mr. Spence’s service had produced too many contradictory impressions to be fitted into any definite pattern; and the chief lesson Millner had learned from them was that life was less of an exact science, and character a more incalculable element, than he had been taught in the schools. In the light of this revised impression, his own footing seemed less secure than he had imagined, and the rungs of the ladder he was climbing more slippery than they had looked from below. He was not without the reassuring sense of having made himself, in certain small ways, necessary to Mr. Spence; and this conviction was confirmed by Draper’s reiterated assurance of his father’s appreciation. But Millner had begun to suspect that one might be necessary to Mr. Spence one day, and a superfluity, if not an obstacle, the next; and that it would take superhuman astuteness to foresee how and when the change would occur. Every fluctuation of the great man’s mood was therefore anxiously noted by the young meteorologist in his service; and this observer’s vigilance was now strained to the utmost by the little cloud, no bigger than a man’s hand, adumbrated by the banker’s unpunctuality. When Mr. Spence finally appeared, his aspect did not tend to dissipate the cloud. He wore what Millner had learned to call his “back-door face”: a blank barred countenance, in which only an occasional twitch of the lids behind his glasses suggested that some one was on the watch. In this mood Mr. Spence usually seemed unconscious of his secretary’s presence, or aware of it only as an arm terminating in a pen. Millner, accustomed on such occasions to exist merely as a function, sat waiting for the click of the spring that should set him in action; but the pressure not being applied, he finally hazarded: “Are we to go on with the _Investigator_, sir?” Mr. Spence, who had been pacing up and down between the desk and the fireplace, threw himself into his usual seat at Millner’s elbow. “I don’t understand this new notion of Draper’s,” he said abruptly. “Where’s he got it from? No one ever learned irreligion in my household.” He turned his eyes on Millner, who had the sense of being scrutinized through a ground-glass window which left him visible while it concealed his observer. The young man let his pen describe two or three vague patterns on the blank sheet before him. “Draper has ideas--” he risked at last.