Jimmy pulled, but pull as he would he could not budge Bobby one inch. He did not dare release the line where it made its turn around the bowlder, for without the leverage he feared the line would get away from him, in which case Bobby would crash to the bottom of the cliff. So Jimmy pulled desperately. But it was of no avail, and presently he took another turn of the line around the bowlder, and secured it so that it could not slip, and ran forward.