ress he could make by the casual methods he was pursuing. Had I not known him better I might have suspected him of being personally interested in Sibella; but such a notion I dismissed simultaneously with its formulation. I noticed, however, that after each call he became unaccountably pensive; and one evening, after we had had tea with Sibella, he sat for an hour before the fire in his living-room without turning a page of the volume of da Vinci's "Trattato della Pittura" which lay open before him.
On one of his visits to the Greene mansion he had met and talked with Rex. At first the youth had been surly and resentful of our presence; but before we went away he and Vance were discussing such subjects as Einstein's general-relativity theory, the Moulton-Chamberlin planetesimal hypothesis, and Poincaré's science of numbers, on a plane quite beyond the grasp of a mere layman like myself. Rex had warmed up to the discussion in an almost friendly manner, and at parting had even offered his hand for Vance to shake.
On another occasion Vance had asked Sibella to be permitted to pay his respects to Mrs. Greene. His apologies to her—which he gave a semiofficial flavor—for all the annoyance caused by the police immediately ingratiated him in the old lady's good graces. He was most solicitous about her health, and asked her numerous questions regarding her paralysis—the nature of her spinal pains and the symptoms of her restlessness. His air of sympathetic concern drew from her an elaborate and detailed jeremiad.
Twice Vance talked to Ada, who was now up and
