PREFACE. 
V 
known regarding them. This was espe¬ 
cially true of the living cliff and cave 
dwellers found abiding in the Northern 
Mexican Sierra Madres, the knowledge 
of whose existence was seemingly con¬ 
fined to the native peons and laborers but 
little above them in the scale of intelli¬ 
gence, on the one side, and an exceed¬ 
ingly few intelligent Mexicans and for¬ 
eigners, mostly engaged in mining, on 
the other, who either did not care to give 
the world any accounts of these strange 
beings or who had interests in keeping 
everything regarding this rich country as 
secret as possible. Quite a long resi¬ 
dence, off and on, in our own Southwest 
country had somewhat familiarized me 
with the dwellings and relics of the cliff 
and cave dwellers of that region, and, in 
common with the general opinion, I 
