ROCKY MOUNTAIN MEDICAL ASSOCIATION. 33 
occupied as dwellings in the mountainous parts of 
Arabia, Nubia, and Upper Egypt, and the many traces 
of such habitations in other parts of the world, fortify 
the belief that in early times they frequently served 
as man's abode, the place for the celebration of his 
religious observances, as well as the spot of his burial. 
Naturally, then, if we remember the condition of prim- 
itive man, human remains and implements should be 
found in these localities as they are, and associated 
with the bones of extinct animals. 
As yet no systematic study has been made of the 
American caves with a view of ascertaining whether 
man's early dwelling-place on this continent may not 
have been similar to w^hat it was in other parts of the 
world. There is reason to believe that there are such 
in the United States that will yet furnish valuable data 
upon this interesting subject. F. W. Putnam, of Massa- 
chusetts, and Dr. Joseph Jones, of New Orleans, and a 
few others, have of late turned their attention to 
their exploration with encouraging results.* It is 
probable that a very long period elapsed between 
the time when the inhabitants of America sheltered 
themselves in caves and places not constructed by 
themselves, and the time when they were in some lo- 
calities, as in Colorado, improved by extending them 
under cliffs and dividing them into apartments, and 
tenanted by a now forgotten race, which explorers call 
"Cliff-Dwellers." 
We must recognize the possibility of distinct races 
troglodyte people, because they lived in caverns. For evidence of this 
kind of habitations in the United States, see Professor Hayden's and 
Lieutenant Wheeler's reports for 1875. (See Annual Report Smith- 
sonian Institution 1874, p. 367.) 
