The above letter, marked "Private," was forwarded to me through the editor of _The Day After To-morrow_. The writer of it was a total stranger to me, even by report, and at first I did not know what to make of it. Was the man a charlatan, or a "crank?" There were no signs of craziness or humbug in his frank and simple sentences. Had he really found out a way of crossing the celestial spaces? In these days it is better not to be too sceptical as to what science will accomplish. It is, in fact, wise to keep the mind open and suspend the judgment. We are standing on the threshold of the Arcana, and at any hour the search-light of our intellect may penetrate the darkness, and reveal to our wondering gaze the depths of the inner mechanism of Nature. I resolved to accept his invitation. A few days later I presented myself at the home of my unknown correspondent. It was a lonely little cottage, in the midst of a wild flat or waste of common ground on the outskirts of London. I should say it had once been the dwelling of a woodman engaged in the neighbouring forest. A tall, thick hedge of holly surrounded the large garden, and almost concealed it from the curiosity of an occasional wanderer on the heath. Certainly it did not look the sort of place to find a man of science, and the old misgivings assailed my mind in greater force than ever. Half regretting that I had come, and feeling in a dubious element, I opened the wicket, and knocked at the door. It was answered by a young woman, in a plain gown of some dark stuff, with a white collar round the neck. In spite of her dress I could see that she was not an ordinary cottage girl. Pretty, without being beautiful, there was a distinction in her voice and manner which bespoke the gentlewoman. With a pleasant smile, she welcomed me as one who had been expected, and ushered me into a small sitting-room, poorly furnished, but with a taste and refinement unusual in a workman's home. A large piano stood in one of the corners, and a pile of classical music lay on a chair beside it. The mantelpiece was decorated with cut flowers, and the walls were hung with portraits and sketches in crayons and water-colour. "My father will be down in a moment," she said, with a slight American accent. "He is delighted to have the pleasure of meeting you. It is so kind of you to come." Before I had time to respond, Mr. Carmichael entered the parlour. He was a man of striking and venerable presence. His long white locks, his bulging brow, pregnant with brain, his bushy eyebrows and deep blue-grey eyes, his aquiline nose and flowing beard, gave an Olympian cast to his noble head. Withal, I could not help noticing that his countenance was lined with care, his black coat seamed and threadbare, his hands rough and horny, like those of a workman. If he appeared a god, it was a god in exile or disgrace; a Saturn rather than a Jove.