How does Frankenstein and his creature retreat to nature in the end of Chapter 10?

Victor determines to climb to the top of Montanvert, one of the region's forbiddingly massive glaciers. The sight of the mountain fills him with a "sublime ecstasy"; he believes that human contemplation of natural wonders "gives wings to the soul and allows it to soar from the obscure world to light and joy." He is filled with melancholy as he ascends the mountain, however, and, amid rain and rockslides, meditates on the impermanence of all human dreams and attachments. When he has reached the summit, Victor invokes all the "wandering spirits" of the dead, and asks them to either permit him to be happy or carry him to his grave. As if summoned by this call, the monster appears in the natural surrounding.