Charles walked homeward with the Professor. He sounded him gently as to the sum required, should need arise, to purchase his secrecy. Already Sir Adolphus had bound us all down to temporary silence--as if that were necessary; but Charles wished to know how much Schleiermacher would take to suppress his discovery. The German was immovable. "No, no!" he replied, with positive petulance. "You do not unterstant. I do not buy and sell. Zis is a chemical fact. We must bublish it for the sake off its seoretical falue. I do not care for wealse. I haff no time to waste in making money." "What an awful picture of a misspent life!" Charles observed to me afterwards. And, indeed, the man seemed to care for nothing on earth but the abstract question--not whether he could make good diamonds or not, but whether he could or could not produce a crystalline form of pure carbon! On the appointed night Charles went back to Lancaster Gate, as I could not fail to remark, with a strange air of complete and painful preoccupation. Never before in his life had I seen him so anxious. The diamonds were produced, with one surface of each slightly scored by the cutters, so as to show the water. Then a curious result disclosed itself. Strange to say, each of the three diamonds given to the three diamond kings turned out to be a most inferior and valueless stone; while each of the three intrusted to the care of the scientific investigators turned out to be a fine gem of the purest quality. I confess it was a sufficiently suspicious conjunction. The three representatives of the diamond interest gazed at each other with inquiring side-glances. Then their eyes fell suddenly: they avoided one another. Had each independently substituted a weak and inferior natural stone for Professor Schleiermacher's manufactured pebbles? It almost seemed so. For a moment, I admit, I was half inclined to suppose it. But next second I changed my mind. Could a man of Sir Charles Vandrift's integrity and high principle stoop for lucre's sake to so mean an expedient?--not to mention the fact that, even if he did, and if Mosenheimer did likewise, the stones submitted to the scientific men would have amply sufficed to establish the reality and success of the experiments! Still, I must say, Charles looked guiltily across at Mosenheimer, and Mosenheimer at Phipson, while three more uncomfortable or unhappy-faced men could hardly have been found at that precise minute in the City of Westminster.