EXPLORATIONS 
1872-1920 
1. Expedition to the Yellowstone Region, as artist to the 
U. S. Geological Survey of the Territories 1872* (See 
Volume III of this series and the Report of the Survey 
for 1872.) 
2. Second expedition to the Yellowstone with the Hayden 
Survey, as geologist, 1878. (See Volume. JII of this 
series and the Report of the Survey for 1878.) 
3. Rocky Mountain exploration with the Hayden Survey in 
Colorado, as artist 1873, and as geologist 1874, 1875 
and 1876, and again with the U. S. Geological Survey 
under Powell in 1887. (See Volume III of this series 
and Reports of the Survey for the years mentioned.) 
4. Survey of the Grand Canyon of the Colorado with Major 
Dutton on the U. S. Geological Survey, as Assistant 
Geologist. (See Volume V, of this series and Reports 
of the Survey for 1880; also the Colorado Atlas published 
in 1882.) 
5. Archaeological explorations in Mexico with Mr. and Mrs. 
Chain and W. H. Jackson, photographers, 1884. 
6. Archaeological explorations in Mexico with Professor 
Gilbert and Major Dutton in 1886. 
7. Archaeological explorations among the ancient cities of 
Yucatan with Allison V. Armour of Chicago in 1895. (See 
Volume VIII of this series and my report on the expedi- 
tion published by the Field Columbian Museum in 1897.) 
8. Brief explorations in Cuba with Major Powell 1900, and 
in Jamaica with Secretary Langley, the latter on the 
study of the flight of the turkey buzzard, seeking the 
secrets of flight. 
