Office of the Chief of Engineers, 



Washington, B. C. } June 28, 1875. 

 Sir: When Major Macomb, of the Topographical Engineers (now colonel of 

 engineers), made his report of an important exploration in New Mexico, in 1859, he 

 was unable to furnish the report on the geology of that region, owing to the fact that 

 Dr. J. S. Newberry, the geologist who accompanied him, was then actively employed 

 in his duties on the Sanitary Commission in the West. 



Colonel Macomb has recently transmitted to this Office Dr. Newberry's report, 

 with its twenty-two illustrations; and I have respectfully to recommend that it be printed 

 at the Government Printing-! )ffice, and that 1,500 copies be furnished for the use of 

 the Engineer 1 department Upon the usual requisition; also, that this Office be authorized 

 to- procure the necessary copies of the illustrations. 



Very respectfully, your obedient servant, 



A. A. Humphreys, 

 Brig. Gen., Chief of Engineers. 

 Hon. William W. Belknap, 



Secretary of War. 

 Approved : 



By order of the Secretary of War : 

 J H. T. Crosby, 



Chief Clerk. 

 June 28, 1875. 



