Scott was off on the instant and Rex was left alone with the unconscious Sydney. His mind was filled with a multitude of thoughts in regard to the strange seizure. Was he, Reginald, responsible for it? What if he had not come to Philadelphia, would it have happened? He tried to console himself with the reflection that the thing was bound to occur any way, and that it was providential that he and Scott were present to give aid. Then he remembered how the attack had come on at the very moment when Sydney learned that he (Rex) had told of their inheritance from the miser, and he felt more dismal than ever. It was very quiet in that great office building at this time of the day. The noise of the car bells and traffic that came in through the open windows from the street far below only made the stillness within more marked. The office boy had taken the mail and gone home just before Rex and Scott arrived. Rex glanced up at the clock. They would not be able to catch the express now. How good Scott was to stay with him. He would pay him back for it all when they came into their fortune. But he seemed to be a long while gone. Rex left his position by Sydney and went to the window. By leaning very far out he could just see over the heavy stone still to the street below. But it was quite impossible to recognize any one at that distance. He wriggled back till his feet touched the floor again, and then returned to take up his watch by Sydney once more. He wished that Roy was with him. Though they were twins he felt that his brother possessed twice the self reliance in emergencies that he did. “I wonder if I ought to telegraph to mother,” was his next thought. Then he heard the door of the elevator slide back, and the next instant Scott Bowman appeared, accompanied by a short man with side whiskers and spectacles. CHAPTER IX THE MYSTERY ABOUT SYDNEY The boys stood by in anxious suspense while the doctor made his examination. “It is utter collapse from severe mental strain,” he said after a minute. “He will come around presently.” He wrote out a prescription and gave it to Scott to take out for him and then turned to Rex. “You are Mr. Pell’s brother, I believe?” he said. “Yes,” answered Rex, for the fact that there was no blood relation between them was one that very seldom recurred to the boys’ minds. “Then perhaps you will be able to assign some cause for this seizure. Was Mr. Pell excited by anything in particular when it took him?” Rex hesitated. Remembering how Sydney had been affected by learning that he had revealed the facts about Mr. Tyler’s will to Scott, he felt that he ought not to speak of the matter to any one else. “Yes, he was excited by a—a family affair,” he replied, hoping this was all he need say on the matter. “Humph!” muttered the physician, and he not only took another critical look at Sydney’s face, but favored Rex with a long stare, too.