10 



this region, in comprehending; the nature and extent of the military 

 operations necessary to control the Indian tribes, 



In preparing this map, besides the information possessed in this 

 office, much that was valuable was obtained from the Indian Bureau 

 and United States Land Office, particularly in regard to the location 

 of the Indian reserves. The attempt to define the boundaries of 

 these Indian tribes is a difficult task, as they are not well established 

 among themselves; and those that are friendly to each other, though 

 using different languages, often mingle to such an extent as to have a 

 common countr}^; as for instance the Crees, Chippewas, and Assin- 

 niboins. It is for this reason, probably, that no map of this kind has 

 ever before been produced. 



Upon returning to Washington, in December last, Lieutenant Warren 

 resumed charge of the j)reparation of the maps, <fec., compiling in this- 

 office, in addition to the duties connected with his own explorations. 

 He has completed his report upon the general map, which forms a 

 part of the Pacific Railroad Report, and will be published with it. 



Lieutenant Abbot, in addition to conducting certain surveys and 

 investigations upon the delta of the Mississippi, under my general 

 direction, and preparing the results, has likewise aided in the duties 

 of this office, and both these officers have, in turn, taken charge of it 

 during n\y absence. 



The appropriation for marldng the southern boundary of Kansas 

 directed that copies of the plats of the line should be furnished to 

 the Secretary of the Interior and the Secretary of tlie Territory of" 

 Kansas. 



Copies of four of the seven sheets of the map of the boundary, as 

 marked by Lieutenant Colonel Johnston, 1st cavalry, have been pre- 

 pared for this jourpose, and those of the remaining three will probably 

 be finished by the 1st of January. They have been copied by Mr. 

 A. Schimmelfennig, who in this instance has, for the first time in this 

 country, successfully applied the photographic process to copying" 

 maps on so large a scale. 



VI. EXPLOIIATIOXS PROPOSED. 



The fields of exploration proposed for the next season are, those in 

 Nebraska, before mentioned; the region along the San Juan to its 

 junction with the Rio Colorado of the West, and along the Spanish 

 trail from that river to Abiqui; the route across the Sierra Nevada to 

 Carson's river, to ascertain its raiboad practicability; and the upper 

 Columbia river, to ascertain its navigability. These, with the topo- 

 graphical examinations made by officers with the various military 

 commands, Avill usefully expend the amount appropriated for military 

 surveys and reconnaissances and geographical explorations. 

 Very respectfullv, your obedient servant, 



A. A. HUMPHREYS, 

 Captain Topograplncal Engineers^ in charge, 

 Hon. John B. Floyd, 



Secretary of Wan-. 



