The inventor tossed off the last sentence contemptuously. But Marcus knew that he did attach a great importance to motives; although he could not fairly be ranked either among the misanthropes or the fools. He therefore replied:
"The whole world is welcome to inquire into my motives. As I understand them, they are: First, I take pleasure in your society, sir, because, like myself, you are a quiet, thinking man. Second, you have a hobby--your machine, there--and I admire people with hobbies. Third, I am fond of children, and--and--your daughter is a very pleasant, intelligent child. Fourth, you have insisted on selling me an interest in your invention, in return for a small loan, and that fact would draw me here, if nothing else did. These are motives enough to satisfy the most inquisitive mind, I should think."
Marcus said this with an attempt at a light laugh. But there was one motive not yet confessed--a motive which could hardly be called a motive, for it lay dim and half-formed within his brain. He had never, in his moments of self-inquisition, acknowledged its existence to himself. How could he, then, venture to disclose it to another? It was the suppression of this immature motive, that brought back that look of deceit and guilt to Marcus Wilkeson's ingenuous face.
This unfortunate physiognomical revelation was not lost upon the keen eyes of the inventor. But he said:
"Mr. Wilkeson, let us not say another word on this ridiculous subject. I am ashamed of myself for showing you the letter. I ought to have thrown it into the fire."
"There I differ with you, my dear sir," said Marcus. "You did perfectly right, and I am glad that I have had the opportunity to define my position here clearly, once and for all." Marcus could not avoid saying this much in mere civility to the inventor, but he indulged the private opinion that that gentleman should have burned the anonymous note.
"Who can have written this scoundrelly thing?" continued Marcus, turning over the letter, and then the envelope, for the twentieth time each, and minutely examining them.
The note was written on a half sheet of common letter paper. The manufacturer's stamp in the corner had been cut off, and the size of the half sheet further diminished by paring down one of the sides. The writing was what is known as "backhanded," in strokes which appeared at first sight to be of a uniform lightness. On inspecting it very closely, Marcus discovered a tendency, in this backhanded penmanship, to ascend from the line; and also that, in a few instances, the downward strokes on certain long letters were a trifle thicker than on others. That the writing was a man's, Marcus had no doubt, though he would have been puzzled to give the reasons which led him to that conclusion. The envelope was the ordinary prepaid-stamped one issued by the Government, and therefore could not contribute to the identification of the anonymous writer. The superscription was in the same backhand, and was peculiar in nothing but a small curved nourish, like Hogarth's line of beauty, beneath the words, "New York. City."
"The rascal has carefully disguised his hand," said Marcus, "and does not mean to be found out. I can say nothing more positive, than that it is written by somebody who has never corresponded with me. My memory of autographs happens to be pretty tenacious."
"And I am positive that it is written by no acquaintance of mine, or of my daughter's, for we have none--except you. As the case now stands, it is a mystery, not worth the exploring."