the partition walls are found in place. The proof of the comparatively modern date of these structures is conclusive from these facts alone. It will be observed that there are six single apartments in the building on the right of the "House of Nuns" which have no connection with the remaining rooms of the building, and that the others are in pairs, a back room connecting with the one in front, and neither with any others. It seems to show very plainly, in the plan of the house itself, that it was designed to be occupied by distinct groups composed of related families, each group a large household by itself If the communal principle in living existed in fact among them, its expression in the interior arrangement of the house, and in this form, might have been expected. This striking and significant feature runs through all the structures, in these areas, of which ground-plans have been obtained.
The triangular ceiling, in effect, is an attempt to extend the lintel in sections across the vault of a chamber in the place of joists, and, so far as the writer is aware, the only attempt ever made by any barbarous people to form a ceiling of stone over ordinary residence rooms. In a wall and ceiling formed in this manner, and carried up several feet above the apex of the triangular arch, there would be no lateral thrust outward of the masonry.
It should be stated that there are neither fire-place, chimneys, nor windows in any of these houses; neither have any been found, so far as the writer is aware, in any ancient structure in Yucatan or Central America. Fires were not needed for warmth; but since they were for cooking, it shows very plainly that no cooking was done within these houses. A presumption at once arises that their inmates prepared their food in the open court, or on the middle terrace, by household groups, making a common stock of their provisions, and dividing from the earthen cauldron, like the Iroquois. The communistic character of these houses is shown by their great size, and by the separation of the rooms, generally in pairs, having no connection with the remainder of the house. Each pair of rooms would accommodate several married pairs with their children; and so would each single apartment, according to the mode of life of the Village Indians. Moreover, communism in living appears to have been a law of man's condition both
