How does Herman Melville use imagery in Typee: A Peep at Polynesian Life [Edited by George Woodcock]?

Imagery:

"Their appearance perfectly amazed me; their extreme of youth, the light clear brown of their complexions, their delicate features, and inexpressibly graceful figures, their softly molded limbs, and free unstudied action, seemed as strange as beautiful." pg. 19

"Five foaming streams, rushing through as many gorges, and swelled and turbid by the recent rains, united together in one mad plunge of nearly eighty feet, and fell with wild uproar into a deep black pool scooped out of the gloomy-looking rocks that lay piled around, and thence in one collected body dashed down a narrow sloping channel which seemed to penetrate into the very bowels of the earth." pg. 64