Fifteen years ago Arthur Greatrex, then a young Cambridge fellow, had just come up to begin his medical studies at a London hospital. He was tall in those days, of course, but not nearly so slender or so pale as now; for he had rowed seven in his college boat, and was a fine, athletic young man of the true English university pattern. Handsome, too, then and always, but with a more human-looking and ordinary handsomeness when he was young than in these latter times of his scientific eminence. Indeed, any one who met Arthur Greatrex at that time would merely have noticed him as a fine, intelligent young English gentleman, with a marked taste for manly sports, and a decided opinion of his own about most passing matters of public interest. Already, even in those days, the young medical student was very deeply engaged in recondite speculations on the question of energy. His active mind, always dwelling upon wide points of cosmical significance, had hit upon the germ of that great revolutionary idea which was afterwards to change the whole course of modern physics. But, as often happens with young men of twenty-five, there was another subject which divided his attention with the grand theory of his life: and that subject was the pretty daughter of his friend and instructor, Dr. Abury, the eminent authority on the treatment of the insane. In all London you couldn't have found a sweeter or prettier girl than Hetty Abury. Young Greatrex thought her clever, too; and, though that is perhaps saying rather too much, she was certainly a good deal above the average of ordinary London girls in intellect and accomplishments. "They say, Arthur," she said to him on the day after their formal engagement, "that the course of true love never did run smooth; and yet it seems somehow as if ours was wonderfully smoothed over for us by everybody and everything. I am the happiest and proudest girl in all the world to have won the love of such a man as you for my future husband." Arthur Greatrex stroked the back of her white little hand with his, and answered gently, "I hope nothing will ever arise to make the course of our love run any the rougher; for certainly we do seem to have every happiness laid out most temptingly before us. It almost feels to me as if my paradise had been too easily won, and I ought to have something harder to do before I enter it." "Don't say that, Arthur," Hetty put in hastily. "It sounds too much like an evil omen." "You superstitious little woman!" the young doctor replied with a smile. "Talking to a scientific man about signs and portents!" And he kissed her wee hand tenderly, and went home to his bachelor lodging with that strange exhilaration in heart and step which only the ecstasy of first love can ever bring one.