It is a dome-shaped structure, with an entrance so low that one must crawl upon his hands and knees in entering; it is a sweat-bath, used for cleanliness and health.

A quick fire, built inside, heats it thoroughly, after which water is thrown upon the hot stones to produce steam.

Four persons, of both sexes, were in the one in question, taking a sweat-bath.

When we returned to our companions, sitting before the church, an indian of the village, accosting Don Romualdo, claimed to know him; he also claimed my acquaintance, and reminded me that he had been one of the subjects I had measured two years before in Tlaxcala.

A score or more of natives had gathered, in the moonlight, around our party.