"The natives use human excrement for tanning leather. When Bernal
Diaz came with Cortés to the great market-place of Mexico City, in
Montezuma's day, he saw the little pots of human excrement in rows for
sale, and the leather-makers going round sniffing to see which was the
best, before they paid for it."
D.H.Lawrence, Mornings in Mexico, 1927.
