Manu.] 232 



marked, because the cilia vibrate so rapidly as to produce a 

 mere line of ligbt, or a sort of halo, not only within the ves- 

 tibule, but along the whole periphery of the rotary organ ; 

 so that the light line, which is generally mistaken for a vi- 

 brating filament, or bristle, may be traced directly from the 

 interior of the body to the outside, and thence continuously 

 all around the disc. 



Mr. Mann spoke of the denudation observed in the rocks 

 of the Hawaiian Islands. 



The west side of Hawaii is remarkable for its dryness, or rather its 

 want of running surface streams, in contrast to the northeast side of 

 the island. From Kawaihae along the whole western coast of the 

 island around to Waiohinu, a distance of one hundred and fifteen 

 miles, there is not a stream of water. At Waiohinu, a village near 

 the southern point of the island, situated in a shallow valley, there is 

 a small stream which takes its rise about ten miles fi-om the sea in 

 three large springs of water, but the stream is lost five miles before 

 reachincT tlie coast. In a direct line from Waiohinu to the volcano of 

 Kilauea, and beyond, along the base of Mauna Loa, a distance of 

 forty miles, there is not another stream. The character of this coun- 

 try, beginning again at Kawaihae, is, first, very barren from that 

 point up the slopes of Mauna Kea and Hualalai; south of Hualalai 

 and west of Mauna Loa, there is a heavily wooded region about ten 

 miles in width, beginning at a distance of five miles from the coast. 

 The rains are here frequent. Southwest of Mauna Loa, and for 

 twenty miles westward from Waiohinu, the country is one vast bed of 

 volcanic fragments, lying in low and undulating ridges, with a sparse 

 and stunted vegetation. Tiie sunmier rains seldom reach the coast in 

 this direction. Southeast of Kilauea, in Puna, as well as in some of 

 the tracts between Waiohinu and Kilauea, there is some forest land, 

 but broken up by immense beds or streams of lava, either in the form 

 of cHnker beds, or the smoother " pahoihoi" of the native language. 

 Where these are found all is barrenness. From a point just north of 

 Kilauea, a point thirty or forty miles west of Hilo, heavily timbered 

 land is again found which stretches north for forty miles around the 

 base of Mauna Kea, in a belt twenty miles wide or thereabouts, be- 

 ginning from three to five miles from the sea-coast. 



This whole region is intersected by almost innumerable streams ; 

 going north by the road from Hilo to Laupohoehoe, there are sixty- 

 five of these gulches to be crossed in a distance of thirty miles, many 

 of them nearly or quite one thousand feet deep, with a raging stream 

 at the bottom, — which all take their rise and receive their su23plles 

 from the swampy land throughout the forest. 



