CHAPTER XI. _Mesas and Foot-Hills._--Flat steps of the desert--Across

Southern Arizona--Rising from the desert--The great mesas--“Grease wood plains”--Upland vegetation--Grass plains--Spring and summer on the plains--Home of the antelope--Beds of soda and gypsum--Riding into the unexpected--The Grand Canyon country--Hills covered with juniper--The Painted Desert--Riding on the mesas--The reversion to savagery--The thin air again--The light and its deceptions--Distorted proportions--Changed colors--The little hills--Painting the desert--Worn-down mountains--Mountain wash--Flattening down the plain--Mountain making--The foot-hills--Forms of the foot-hills--Mountain plants--Bare mountains--The southern exposures--Gray lichens--Still in the desert--Arida Zona--Cloud-bursts in the mesas--Wash of rains--Gorge cutting--In the canyons--Walls of rock--Color in canyon shadows--Blue sky--Desert landscape--Knowledge of Nature--Nature-lovers--Human limitations 194