In ascending some of the steeps that rise on either side of the streams near Kina Balu, we continually came across boulders of granite, which, in comparatively few years, will, through landslips, roll many hundred feet into the stream below, to commence their gradual movement from the mountain. I have continually come across evidences of the Bornean rivers having flowed at a much higher level than at present, finding layers of water-worn pebbles, a hundred feet above the present surface of the stream. In Borneo, where the rain falls so heavily, the power of water is immense. After a heavy storm, the torrents rise in confined spaces often fifty feet within a few hours, and the rush of the stream would move any but the largest rocks, and wash away most of the effects of the landslips. Standing on a height overlooking a large extent of country, it is instructive to be able to survey at a glance the great effect caused by the rivers and all their tributaries, deep gullies marking every spot where an accession joins the parent stream. After heavy rains, the rivers present the colour of _café au lait_, from the large amount of matter held in temporary suspension, and on taking out a glassful, I have been surprised by the amount of sediment which has immediately fallen to the bottom. The walk was becoming rather tiring; drizzling rain rendering the stones very slippery, and having continually to make the mountain torrent our path, it was severe work for our bare feet. The rain continuing, and the stream rapidly rising, we halted at some farm-houses in the midst of a long rice-field. Fording the river is difficult work; the water rushing down at headlong speed, renders it necessary to exert one’s utmost strength to avoid being carried away: the pole in both hands, placed well to seaward, one foot advanced cautiously before the other, to avoid the slippery rocks and loose stones. I found that this fatigued me more than the walking. The water became much cooler as we approached the mountain, while the land is rapidly increasing in elevation. The river was full of Ida’an fish-traps, made by damming up half the stream, and forcing the water and fish to pass into a huge bamboo basket. They appeared to require much labour in the construction, particularly in the loose stone walls or dams. As we advanced, we found the whole stream turned into one of these traps, in which they captured very fine fish, particularly after heavy rain. I bought one with large scales, about eighteen inches long, which was of a delicious flavour.