COISTTENTS. 
PART FIRST. 
HISTORY OF THE EXPLORATION OF THE CANONS OF THE COLORADO. 
Page. 
CHAPTER I. The Valley of the Colorado 3 
II. From Green River City to Flaming Gorge 8 
III. From Flaming Gorge to the Gate of Lodore 14 
IV. The Ca!ion of Lodore 22 
V. From Echo Park to the mouth of the Uinta River 33 
VI. From the month of the Uinta River to the junction of the Grand and Green 45 
"VII. From the junction of the Grand and Green to the month of the Little Colorado 57 
VIII. The Grand Canon of the Colorado 81 
IX. The Rio Virgen and the U-in-ka-ret Mountains 106 
X. Report on a trip to the mouth of the Dirty Devil River. A. H. Thompson 134 
PART SECOND. 
ON THE PHYSICAL FEATURES OF THE VALLEY OF THE COLORADO. 
CHAPTER XI. Ou the physical features of the Valley of the Colorado 149 
XII. On the physical features of the Valley of the Colorado, continued 183 
PART THIRD. 
ZOOLOGY. 
CHAPTER XIII. Abstracts of results of a study of the genera Geomys and Thomomys. Elliott Coues 217 
ADDENDUM A.. The cranial and dental characters of Geoinyidaj. Elliott Coues 267 
ADDENDUM B. Notes on the Salamander of Florida, (Geomys Tueza.) G. Brown Goode 281 
