As a mere youth he showed the most adventurous spirit and ardent ambition to excel his mates, to do deeds of skill and dexterity that others could not do. When still a child he was running up an unsupported eight-foot ladder, and balancing himself upon the topmost round in a way to startle the cleverest professional athletes. A little later, getting hold of any old rope, stretching it in any old way as a "slack-rope," he was busy perfecting himself as a slack-rope walker. Naturally, school held him only a very few years, for his type of mind obviously was not that of a student. While still in early youth, he got his father's consent to work in the parental studio, and persevered long enough to acquire some ability in sketching. Later he employed this art in illustrating some of his aerial voyages. During these studio days he studied legerdemain and ventriloquism, and became one of the most expert sleight-of-hand wizards and ventriloquial entertainers of his time. Donaldson's first appearance before the public was at the old Long's Varieties on South Third Street in Philadelphia. His feats as a rope-walker have probably never been surpassed. In 1862 a rope twelve hundred feet long was stretched across the Schuylkill River at Philadelphia at a height of twelve hundred feet above the water. After passing back and forth repeatedly over this rope, he finished his exhibition by leaping from a rope into the river from a height of approximately ninety feet. Two years later he successfully walked a rope eighteen hundred feet long and two hundred feet high, stretched across the Genesee Falls at Rochester, N. Y. Five years later he was riding a velocipede on a tight-wire from stage to gallery of a Philadelphia theatre, the first to do this performance. Thus his years were spent between 1857 and 1871; and great as were the dangers and severe the tasks incident to this period of his career, to him it was not work but the play he loved. While the work in itself was not one to emulate--for there are perhaps few less useful tasks than those that made up his occupation--nevertheless, he was training himself for his career; and the absolute mastery over it which he accomplished, the boldness with which he did it, the readiness, certainty, and complete success with which he carried out everything he undertook make a lesson worth studying.