The nature of the mark which Dick chose for experimenting upon was singular. He had found some panes of glass which had been removed from an old sash, and he placed these successively before his target, arranging them at different angles. He found that a bullet would go through the glass without glancing or having its force materially abated. It was an interesting fact in physics, and might prove of some practical significance hereafter. Nobody knows what may turn up to render these out-of-the-way facts useful. All this was done in a quiet way in one of the bare spots high up the side of The Mountain. He was very thoughtful in taking the precaution to get so far away; rifle-bullets are apt to glance and come whizzing about people's ears, if they are fired in the neighborhood of houses. Dick satisfied himself that he could be tolerably sure of hitting a pane of glass at a distance of thirty rods, more or less, and that, if there happened to be anything behind it, the glass would not materially alter the force or direction of the bullet. About this time it occurred to him also that there was an old accomplishment of his which he would be in danger of losing for want of practice, if he did not take some opportunity to try his hand and regain its cunning, if it had begun to be diminished by disuse. For his first trial, he chose an evening when the moon was shining, and after the hour when the Rockland people were like to be stirring abroad. He was so far established now that he could do much as he pleased without exciting remark. The prairie horse he rode, the mustang of the Pampas, wild as he was, had been trained to take part in at least one exercise. This was the accomplishment in which Mr. Richard now proposed to try himself. For this purpose he sought the implement of which, as it may be remembered, he had once made an incidental use,--the lasso, or long strip of hide with a slip-noose at the end of it. He had been accustomed to playing with such a thong from his boyhood, and had become expert in its use in capturing wild cattle in the course of his adventures. Unfortunately, there were no wild bulls likely to be met with in the neighborhood, to become the subjects of his skill. A stray cow in the road, an ox or a horse in a pasture, must serve his turn,--dull beasts, but moving marks to aim at, at any rate.