Note 108 — II.

I am just (Sept. 9) informed by Governor Wallace, that the Sierra de Tecolote, east of the ruins, contains probably gypsum, even in the form of alabaster. It is certain that nothing like lime-kilns or places where lime might have been burnt are found at any moderate distance from the ruins. The surrounding rocks, up to head of the valley and to the mesa, contain deposits of white, yellow, and red carbonates of lead, often copper-stained, and very impure, therefore proportionately light in weight. However, we have very positive information as to how they made their plaster, etc., in Castañeda, Voyage de Cibola, ii. cap. iv. pp. 168, 169. He says: "They have no lime, but make a mixture of ashes, soil, and of charcoal, which replace it very well; for although they raise their houses to four stories, the walls have not more than half an ell in width. They form great heaps of pine [thym] and reeds, and set fire to them; whenever this mass is reduced to ashes and charcoal, they throw over it a large quantity of soil and water, and mix it all together. They knead it into round blocks, which they dry, and of which they make use in lieu of stones, coating the whole with the same mixture." Substituting for the "round blocks" the stones found at Pecos, we have the whole process thoroughly explained, for indeed the mud contains bits of charcoal, as the specimens sent prove. The white coat, however, is not explained. I must state here, however, that I found the latter only in such parts of A, as well as of B, as appeared to be most recent in occupation and in construction. Further investigations at other pueblos may yet solve the mystery.