CHAPTER XVIII.
INTO THE BOWELS OF THE EARTH.
The Grand Cañon of the Colorado--Niagara Outdone--The Course of the Colorado River--A Survey Party Through the Cañon--Experiences of a Terrible Night--Wonderful Contrasts of Color in the Massive Rocks--A Natural Wall a Thousand Feet High--Hieroglyphics which have Never been Deciphered--Relics of a Superior Race--Conjecture as to the Origin of the Ancient Bearded White Men.