My dear wife had died when I was thirty-six years of age, leaving me with one child, my son Mark, then about fifteen years old. In my intense sorrow at my bereavement I should probably have become almost a hermit had it not been for my boy who, having been carefully educated, was a bright and intelligent lad. I now took him under my special care and made it my constant endeavour to impart to him such of my own knowledge as seemed likely to be useful or interesting, hoping to keep him with me for many years as a companion. He soon became imbued with my love of mechanical pursuits and also with my passion for astronomy and allied sciences, developing an interest in Mars equal to if not surpassing my own. His most intimate schoolfellow was John Claxton, and, as there was a very strong friendship between them, we were so much together that I came to regard him almost as a second son. When my boy was in his twentieth year I noticed that a great change came over him, for instead of being cheerful and high-spirited he became very quiet and self-absorbed, and there was often a faraway look in his eyes which puzzled me very much. One morning I went to call him at his usual time for rising and found him in a deep sleep from which I was unable to rouse him. After trying some time without effect his stupor so alarmed me that I immediately sent off for a doctor, who advised that it would be best to let him lie and he would probably awaken naturally in a few hours' time. This indeed proved to be the case; and, as soon as he awoke, the doctor carefully examined him, but could find nothing wrong to account for what had happened. A month later he had a similar seizure, with the same result, but this time his sleep lasted nearly thirty hours. On the doctor's advice I then took him to the seaside for several weeks' stay, and there he soon regained his usual buoyancy of spirits. Shortly after our return home, however, he had a third seizure from which he never awoke, but, to my profound sorrow, passed quietly away. Just before the end came I noticed his lips move slightly as though he were trying to speak, and on bending down to listen I thought I caught faintly what sounded like the words, "I am coming," but whether this really were so I could not be sure.