About four o'clock
Jonas and Agnew prepared a simple dinner and immediately after they embarked . For two hours the river flowed swiftly and quietly between sheer walls of stratified granite , white and pale yellow , shot with rose . Now and again a cedar , dwarfed and distorted , found toe hold between the strata and etched its deep green against the white and yellow . About four o'clock the river widened and the walls were broken by lateral canyons that led back darkly and mysteriously into the bowels of the desert . For half an hour more Milton guided the Ida onward . Then Enoch cried , `` Milton , see that brook ! '' and he pointed to a tumbling little stream that issued from one of the side canyons .