Many of its precepts resembled very closely those of Christianity, and yet the whole was contaminated by the wholesale sacrifices.

It is supposed that this dual religion was the result of the mixture of two peoples, the mild and gentle tenets of the Toltecs being adopted by the fierce Aztec invaders, who added to them their own superstitious and bloody rites.
All this, however, was unknown to Roger at the time.

He saw the dark side of their religion, only, and was ignorant that there underlay it a system which, in point of morality, love of order and method, and a broad charity, was in no way inferior to that practiced among Christian nations.
For some reason, of which Roger was ignorant--but which was, doubtless, in order to avoid the delays occasioned by stoppages at large towns, and to push on the faster towards the capital, where the king and his counselors were impatient to behold the white stranger--a detour was made.

The towns of Puebla and Cholula were avoided, and the party pushed on rapidly across the plateau land they were now ascending, where the air was again keen and piercing.
The road passed between two of the highest mountains in the North American continent--the great volcano Popocatepetl, meaning "the hill that smokes," and Iztaccihuatl, or "the white woman," so called from the bright robe of snow which extended far down its sides.

The lower part of these mountains was covered with dense forests, above which rock, lava, and ashes extended to the summit of the crater of the volcano.
At night the party sheltered in one of the stone buildings, erected by government at intervals along the road, for the accommodation of travelers and couriers.