About four o'clock
Twice we forded , and twice we had to make great climbs up and down again in order to get by points that came boldly down to the river . It was curious to see the nature of the country change . The pines on the mountains to our right and left seemed to push down nearer to our level ; the grass turned green ; the stream narrowed and became swifter ; the sky seemed to turn bluer ; and from the ranges breathed a cool , refreshing wind . About four o'clock we camped . The flat was green ; little clumps of cedar pushed out across it ; the oaks had given place to cottonwoods ; we had now to make acquaintance with new birds . But what particularly interested us was the fact that at this point the high cañon walls at either side broke into rounder hills that opened out widely , and that from among them descended many ravines , barrancas , and dry washes . The following morning we went prospecting again .