EXPOSITIONS . 
The Smithsonian Institution, the National Museum 
and the Geological Survey were called upon with great fre- 
quency during the exposition period, (1876-1916 . The 
collections already in hand were utilized and extensive 
collections were made and exhibis prepared for the various 
occasions, adding thus materially to the riches of the 
National Museum. It happened that I was called upon for 
active participation in the Centennial Exposition in 1876, 
partly because I had just completed studies in the Pueblo 
Cliff House country and had in hand the construction of 
several models of villages and ruined Puebloes and no end 
of collections of pottery, stone implements and other art 
objects • Although employed in the Hayden Survey of the 
Territories I took part on account of my artistic skill, 
in nearly all of the expositions throughout the period. 
Remnants of these exhibits are to be found today 
not only in the National Museum but in collections preserved 
in other Museums throughout the country. These interest- 
ing and important undertakings can not be more than briefly 
mentioned in this account, but the reports of all are pub- 
lished in more or less elaborate form in the annual reports 
of the Museum and as a rule in reports of the various exposi- 
tions. Were I so disposed, several volumes of descriptive 
