"Boule furniture," he explained, "is usually of ebony inlaid with tortoise-shell, and incrusted with arabesques in metals of various kinds. The incrustation had to be very exact, and to get it so, the artist clamped together two plates of equal size and thickness, one of metal, the other of tortoise-shell, traced his design on the top one, and then cut them both out together. The result was two combinations, the original, with a tortoise-shell ground and metal applications; and the counterpart, appliqué metal with tortoise-shell arabesques. The original was really the one which the artist designed and whose effects he studied; the counterpart was merely a resultant accident with which he was not especially concerned. Understand?" "Yes, I think so," I said. "It's a good deal as though Michael Angelo, when he made one of his sketches, white on black, put a sheet of carbon under his paper and made a copy at the same time, black on white." "Precisely. And it's the original which has the real artistic value. Of course, the counterpart is often beautiful, too, but in a much lower degree." "I can understand that," I said. "And now, Lester," Vantine went on, his eyes shining more and more, "if my supposition is correct--if the Grand Louis was content with the counterpart of this cabinet for the long gallery at Versailles, who do you suppose owned the original?" I saw what he was driving at. "You mean one of his mistresses?" "Yes, and I think I know which one--it belonged to Madame de Montespan." I stared at him in astonishment, as he sat back in his chair, smiling across at me. "But," I objected, "you can't be sure--" "Of course I'm not sure," he agreed quickly. "That is to say, I couldn't prove it. But there is some--ah--contributory evidence, I think you lawyers call it Boule and the Montespan were in their glory at the same time, and I can imagine that flamboyant creature commissioning the flamboyant artist to build her just such a cabinet." "Really, Vantine," I exclaimed, "I didn't know you were so romantic. You quite take my breath away." He flushed a little at the words, and I saw how deeply in earnest he was. "The craze of the collector takes him a long way sometimes," he said. "But I believe I know what I'm talking about. I am going to make a careful examination of the cabinet as soon as I can. Perhaps I'll find something--there ought to be a monogram on it somewhere. What I want you to do is to cable my shippers, Armand et Fils, Rue du Temple, find out who owns this cabinet, and buy it for me." "Perhaps the owner won't sell," I suggested. "Oh yes, he will. Anything can be bought--for a price." "You mean you're going to have this cabinet, whatever the cost?" "I mean just that." "But, surely, there's a limit." "No, there isn't." "At least you'll tell me where to begin," I said. "I don't know anything of the value of such things."