88 EXTRACTS FROM TINKHAM S REPORT. 



Falls, continues along the dividing ridge between the Mississippi, Rrd river, and the Minnesota, 

 until entering upon the prairie of the Bois des Sioux, pursues its same general direction through 

 this prairie, passes thence on to the summit-grounds bcLween the James and Shayenne rivers, 

 and finally, without losing its elevation, enters and passes the great plateau of the Missouri by a 

 coulee connecting the two valleys of the Mouse and Missouri rivers, and for a time piercing the 

 barrier which separates them. 



Proceeding up the Missouri from the mouth of the Great Muddy river to the entering of Milk 

 river, the railroad line for nearly ISO miles follows the favorable valley of this latter stream ; 

 then, leaving it, passes on to the prairies, and so continues until within a few miles of the 

 mo .ntain pass, crossing in succession Marias, Teton, and Sun rivers, with the tributaries of 

 Dearborn river. 



