He rubbed his left shoulder thoughtfully and saw a slight tremor at the corners of the girl's mouth. It caused his vision to clear and concentrate; he found that the lips were, in fact, in the very act of smiling. The face of the doctor brightened. "You shall ride my own horse," said the girl. "She is perfectly gentle and has a very easy gait. I'm sure you'll have not the slightest trouble with her." "And you?" "I'll find something about town; it doesn't matter what." "This," said the doctor, "is most remarkable. You choose your mounts at random?" "But you will go?" she insisted. "Ah, yes, the trip to the ranch!" groaned the doctor. "Let me see: the physical obstacles to such a trip while many are not altogether insuperable, I may say; in the meantime the moral urge which compels me towards the ranch seems to be of the first order." He sighed. "Is it not strange, Miss Cumberland, that man, though distinguished from the lower orders by mind, so often is controlled in his actions by ethical impulses which override the considerations of reason? An observation which leads us towards the conclusion that the passion for goodness is a principle hardly secondary to the passion for truth. Understand that I build the hypothesis only tentatively, with many reservations, among which--" He broke off short. The smile was growing upon her lips. "I will put together a few of my things," said the doctor, "and come down to you at once." "Good!" said the girl, "I'll be waiting for you with two horses before you are ready." He turned away, but had taken hardly a step before he turned, saying: "But why are you so sure that you will be ready before I--" but she was already down the steps from the veranda and stepping briskly down the street. "There is an element of the unexplainable in woman," said the doctor, and resumed his way to his room. Once there, something prompted him to act with the greatest possible speed. He tossed his toilet articles and a few changes of linen into a small, flexible valise and ran down the stairs. He reached the veranda again, panting, and the girl was not in sight; a smile of triumph appeared on the grave, colourless lips of the doctor. "Feminine instinct, however, is not infallible," he observed to himself, and to one of the cowboys, lounging loosely in a chair nearby, he continued his train of thoughts aloud: "Though the verity of the feminine intuition has already been thrown in a shade of doubt by many thinkers, as you will undoubtedly agree." The man thus addressed allowed his lower jaw to drop but after a moment he ejaculated: "Now what in hell d'you mean by that?" The doctor already turned away, intent upon his thoughts, but he now paused and again faced the cowboy. He said, frowning: "There is unnecessary violence in your remark, sir." "Duck your glasses," said the worthy in question. "You ain't talkin' to a book, you're talking to a man."