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more unusual and inexplicable it seemed. I gave that end of it up, but the fact that Strong had gone to secure the combination of the safe suggested to me to examine that article. There was certainly no evidence of robbery or even of an attempt at robbery there.

      "Was any doctor called?" asked Kennedy.

      "Yes," he replied. "Though I knew it was of no use I called in Dr. Howe, who lives up the street from the laboratory. I should have called Dr. Harris, who used to be my own physician, but since his return from Africa with the Borland expedition, he has not been in very good health and has practically given up his practice. Dr. Howe is the best practising physician in town, I think."

      "We shall call on him to-morrow," said Craig, snapping his watch, which already marked far after midnight.

      Dr. Howe proved, the next day, to be an athletic-looking man, and I could not help noticing and admiring his powerful frame and his hearty handshake, as he greeted us when we dropped into his office with a card from Winslow.

      The doctor's theory was that Cushing had committed suicide.

      "But why should a young man who had invented a new method of polymerising isoprene, who was going to become wealthy, and was engaged to a beautiful young girl, commit suicide?"

      The doctor shrugged his shoulders. It was evident that he, too, belonged to the "natural rubber set" which dominated Goodyear.

      "I haven't looked into the case very deeply, but I'm not so sure that he had the secret, are you?"

      Kennedy smiled. "That is what I'd like to know. I suppose that an expert like Mr. Borland could tell me, perhaps?"

      "I should think so."

      "Where is his office?" asked Craig. "Could you point it out to me from the window?"

      Kennedy was standing by one of the windows of the doctor's office, and as he spoke he turned and drew a little field glass from his pocket. "Which end of the rubber works is it?"

      Dr. Howe tried to direct him but Kennedy appeared unwarrantably obtuse, requiring the doctor to raise the window, and it was some moments before he got his glasses on the right spot.

      Kennedy and I thanked the doctor for his courtesy and left the office.

      We went at once to the office of Dr. Harris, to whom Winslow had also given us cards. We found him an anæmic man, half asleep. Kennedy tentatively suggested the murder of Cushing.

      "Well, if you ask me my opinion," snapped out the doctor, "although I wasn't called into the case, from what I hear, I'd say that he was murdered."

      "Some seem to think it was suicide," prompted Kennedy.

      "People who have brilliant prospects and are engaged to pretty girls don't usually die of their own accord," rasped Harris.

      "So you think he really did have the secret of artificial rubber?" asked Craig.

      "Not artificial rubber. Synthetic rubber. It was the real thing, I believe."

      "Did Mr. Borland and his new chemist Lathrop believe it, too?"

      "I can't say. But I should surely advise you to see them." The doctor's face was twitching nervously.

      "Where is Borland's office?" repeated Kennedy, again taking from his pocket the field glass and adjusting it carefully by the window.

      "Over there," directed Harris, indicating the corner of the works to which we had already been directed.

      Kennedy had stepped closer to the window before him and I stood beside him looking out also.

      "The cut was a very peculiar one," remarked Kennedy, still adjusting the glasses. "An artery and a vein had been placed together so that the endothelium, or inner lining of each, was in contact with the other, giving a continuous serous surface. Which window did you say was Borland's? I wish you'd step to the other window and raise it, so that I can be sure. I don't want to go wandering all over the works looking for him."

      "Yes," the doctor said as he went, leaving him standing beside the window from which he had been directing us, "yes, you surely should see Mr. Borland. And don't forget that young chemist of his, Lathrop, either. If I can be of any more help to you, come back again."

      It was a long walk through the village and factory yards to the office of Lewis Borland, but we were amply repaid by finding him in and ready to see us. Borland was a typical Yankee, tall, thin, evidently predisposed to indigestion, a man of tremendous mental and nervous energy and with a hidden wiry strength.

      "Mr. Borland," introduced Kennedy, changing his tactics and adopting a new role, "I've come down to you as an authority on rubber to ask you what your opinion is regarding the invention of a townsman of yours named Cushing."

      "Cushing?" repeated Borland in some surprise. "Why—"

      "Yes," interrupted Kennedy, "I understand all about it. I had heard of his invention in New York and would have put some money into it if I could have been convinced. I was to see him to-day, but of course, as you were going to say, his death prevents it. Still, I should like to know what you think about it."

      "Well," Borland added, jerking out his words nervously, as seemed to be his habit, "Cushing was a bright young fellow. He used to work for me until he began to know too much about the rubber business."

      "Do you know anything about his scheme?" insinuated Kennedy.

      "Very little, except that it was not patented yet, I believe, though he told every one that the patent was applied for and he expected to get a basic patent in some way without any interference."

      "Well," drawled Kennedy, affecting as nearly as possible the air of a promoter, "if I could get his assistant, or some one who had authority to be present, would you, as a practical rubber man, go over to his laboratory with me? I'd join you in making an offer to his estate for the rights to the process, if it seemed any good."

      "You're a cool one," ejaculated Borland, with a peculiar avaricious twinkle in the corners of his eyes. "His body is scarcely cold and yet you come around proposing to buy out his invention and—and, of all persons, you come to me."

      "To you?" inquired Kennedy blandly.

      "Yes, to me. Don't you know that synthetic rubber would ruin the business system that I have built up here?"

      Still Craig persisted and argued.

      "Young man," said Borland rising at length as if an idea had struck him, "I like your nerve. Yes, I will go. I'll show you that I don't fear any competition from rubber made out of fusel oil or any other old kind of oil." He rang a bell and a boy answered. "Call Lathrop," he ordered.

      The young chemist, Lathrop, proved to be a bright and active man of the new school, though a good deal of a rubber stamp. Whenever it was compatible with science and art, he readily assented to every proposition that his employer laid down.

      Kennedy had already telephoned to the Winslows and Miss Winslow had answered that Strong had returned from Boston. After a little parleying, the second visit to the laboratory was arranged and Miss Winslow was allowed to be present with her father, after Kennedy had been assured by Strong that the gruesome relics of the tragedy would be cleared away.

      It was in the forenoon that we arrived with Borland and Lathrop. I could not help noticing the cordial manner with which Borland greeted Miss Winslow. There was something obtrusive even in his sympathy. Strong, whom we met now for the first time, seemed rather suspicious of the presence of Borland and his chemist, but made an effort to talk freely without telling too much.

      "Of course you know," commenced Strong after proper urging, "that it has long been the desire of chemists to synthesise rubber by a method that will make possible its cheap production on a large scale. In a general way I know what Mr. Cushing had done, but there are parts of the process which are covered in the patents applied for, of which I am not at liberty to speak yet."

      "Where are the papers in the case, the documents showing the application for the patent, for instance?" asked Kennedy.

      "In

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