A slight noise at the door caused him to turn. Katherine came swiftly to his side. "How is he?" she asked eagerly. "Rallying perfectly. The crisis is past for the present. Unless something unexpected occurs, we shall pull him through." "Why didn't you call me?" asked Katherine. "You needed the rest," he replied. "Though the danger point is almost over, you will have a long siege of nursing that will tax your utmost strength. I shall remain here until I am reasonably sure he is safe, and then, you can take charge. Do you know how to use a thermometer or take a pulse?" "Yes. Doctor King taught me that." "Then you can manage as well as though you had a trained nurse here. But, remember! You must conserve your strength. That is rule number one for a nurse. It is inflexible. Understand?" "I promise to do exactly what you say," she replied. "Now I am going to get your breakfast and a good strong cup of coffee will be ready very soon." Glendon continued to improve during the day, and Powell's vigilance never relaxed. Katherine relieved the doctor for a few hours at a time. When a week had elapsed without developing unfavourable symptoms, Glendon was pronounced practically out of danger. The doctor knew his own weakness now, and with his patient on the road to recovery, Powell's antagonism to the man returned with greater intensity. Yet, as the doctor rode home he determined that as soon as Glendon was well enough, he would try to awaken any shred of decency that might be dormant in the husband of Katherine Glendon, the woman whom Powell loved. The professional calls continued several weeks, but Powell and Katherine only met in the room where Glendon lay weak and thoroughly frightened, for Powell impressed upon Glendon the seriousness of his physical condition and the inevitable result of continuous drinking, which had weakened his heart. Glendon's promises to reform were genuine. Another month went past. An awkward restraint had grown gradually between Katherine and the doctor, and though he flayed his conscience, he could find no reason for it. As days went by, it became unbearable torture for him to see her in her home with Glendon, and yet, it was still harder to resist the temptation to go there. Finally Powell determined to leave the Springs, and Chappo a week later carried a note to Katherine. _Dear Mrs. Glendon:_ I shall be at the Diamond H ranch for a month, after which time I am leaving Arizona for an indefinite period, on business pertaining to the plans for the Sanitarium. Limber and Chappo will be at the Springs all the time, so do not hesitate to call on them should you require assistance at any time or in any way. With my sincere regards for your husband and yourself, Most cordially yours, CUTHBERT POWELL