His eyes fairly gleamed with the enthusiasm of creation. He had found the answer to one of those difficult problems like: "What bright genius can supply the missing letters to make up the name of this great American martyr, who was also a President and freed the slaves? L-NC-LN. $100.00 in GOLD to be divided among the four million successful solvers! _Send no money_ until afterwards!" Mr. Wallingford brought down the legs of his chair with a thump. "By George!" he ejaculated. "I'm glad I found you. You're a man of remarkable resource, and I must be a dumbhead. Here I have been puzzling and puzzling with this problem, and it never occurred to me to roughen those tacks!" It was now Mr. Lamb's turn to find the fat, black cigar, to light it, to lean back comfortably and to contemplate Mr. Wallingford with triumphantly smiling eyes. The latter gentleman, however, was in no contemplative mood. He was a man all of energy. He had two bellboys at the door in another minute. One he sent for a quart of wine and the other to the hardware store with a list of necessities, which were breathlessly bought and delivered: a small table-vise, a heavy hammer, two or three patterns of flat files and several papers of tacks. Already in one corner of Mr. Wallingford's room stood a rough serving table which he had been using as a work bench, and Mr. Lamb could not but reflect how everything needed came quickly to this man's bidding, as if he had possessed the magic lamp of Aladdin. He was forced to admire, too, the dexterity with which this genius screwed the small vise to the table, placed in its jaws a row of tacks, and, pressing upon them the flat side of one of the files, pounded this vigorously until, upon lifting it up, the fine, indented pattern was found repeated in the hard heads of the tacks. The master magician went through this operation until he had a whole paper of them with roughened heads; then, glowing with fervid enthusiasm which was quickly communicated to his helper, he set Mr. Lamb to gluing bits of cloth upon these heads, to be trimmed later with delicate scissors, an extra pair of which Mr. Wallingford sent out to get. When the tacks were all set aside to dry the coworkers addressed themselves to the contents of the ice pail; but, as the host was pulling the cork from the bottle, and while both of them were perspiring and glowing with anticipated triumph in the experiment, Mr. Wallingford's face grew suddenly troubled. "By George, Eddy"--and Mr. Lamb beamed over this early adoption of his familiar first name--"if this experiment succeeds it makes you part inventor with me!" Eddy sat down to gasp. CHAPTER IV J. RUFUS ACCEPTS A TEMPORARY ACCOMMODATION AND BUYS AN AUTOMOBILE The experiment was a success. Immediately after lunch they secured a fresh pine board and pounded all the tacks into it. Not one top came off. The fact, however, that Mr. Lamb was part inventor, made a vast difference in the proposition.