landing him on both feet; the trout leap, which does the same thing twice in quick succession and with the legs crossed; twenty-two monkey jumps without stopping; a great variety of table and board jumps; the goat and hare leaps; the leap through eight rings, one from floor to ceiling, over chairs, etc.”[150] The enjoyment is of course strengthened when the already interesting motion becomes sensuously agreeable; a low degree of such pleasure is experienced in witnessing regular motion in a single direction, such as that of a rushing stream or of clouds sailing across the heavens. In one of his verses Gottfried Keller calls these latter the “friendly companions of the dwellers on earth.” “As they wander on they attract and distract the burdened soul of him who observes them with wonder, and keep him amused all through the weary hours.” Gurgling springs add to their upward gushing motion the soft underground murmur of their waters, while the beauty of circling motion is perhaps never more effectively shown than in the majestic floating of birds of prey. Darwin says in his Voyage of the Beagle round the World: “When the condors are wheeling in a flock round and round any spot their flight is beautiful. Except when rising from the ground, I do not recollect ever having seen one of these birds flap its wings. Near Lima I watched several for nearly half an hour, without once taking off my eyes. They moved in large curves, sweeping in circles, descending and ascending, without giving a single flap.” Perhaps our pleasure is even greater in wave motions, as they roll over the ocean or are produced by the wind on a field of grain, or surge in the current of a rapid stream. These noble verses of Mörike’s on the Rhine falls bear witness to the power of the æsthetic feeling so aroused: “Halte dein Herz, o Wanderer, fest in gewaltigen Händen! Mir entstürzte vor Lust zitternd das meinige fast. Rastlos donnernde Massen auf donnernde Massen geworfen, Ohr und Auge wohin retten sie sich im Tumult?... “Rosse der Götter, im Schwung, eins über den Rücken des ander Stürmen herunter und streu’n silberne Mähnen umher; Herrliche Leiber, unzählbare, folgen sich, nimmer dieselben, Ewig dieselbigen—wer wartet das Ende wohl aus?”[151]