LETTER OF TRANSMITTAL. 



United States Engineer's Office, 



Bock Island, 111,, June 18, 1875. 

 General: I have this day forwarded to you the Geological Report of Dr. J. S. 

 Newberry, geologist of the §>an Juan exploration party, which went from Santa Fe', 

 New Mexico, to the vicinity of the junction of Grand and Green Rivers, in Utah, and 

 hack to Santa Vv, in the summer of L859, and which party was in my charge. 



This is the report to which I alluded in my report to you of November 1, 1860, 

 as setting forth whatever the route above mentioned afforded of interest to the public 

 at large or to the man of science. I trust it jnay be found possible to publish it. 



The report is arranged in seven chapters, with a prefatory note, and is accom- 

 panied by the following sketches and drawings, viz: 



Eleven water-color sketches, showing characteristic scenery of the region in 

 Northwestern New Mexico, Southwestern Colorado, and Southeastern Utah. Also, 

 eleven drawings (eighl of fossils and three of scenery), all of which are interesting and 

 important in connection with the report 



Mv map of the route was engraved on a steel plate, and is on the fdes of the 

 Engineer I >epartment. 



I remain, very respectfully, your most obedient servant, 



J. N. Macomb, 

 Colonel of Engineers, United Siates Army. 

 Brig. Gen. A. A. Humphreys, 



Chief of Engineers, United States Army. 



