To jaunte it was necessary (among other things) for a man to know exactly where he was and where he was going, or there was little hope of arriving anywhere alive. It was as impossible to jaunte from an undetermined starting point as it was to arrive at an unknown destination. Like shooting a pistol, one had to know where to aim and which end of the gun to hold. But a glance through a window or door might be enough to enable a man to memorize the L-E-S co-ordinates of a place.