10 EXPLORATIONS ACROSS THE GREAT BASIN OF UTAH. 



I must also express my acknowledgments of cheerful service 'rendered by my 

 assistant in the office, Lieut. Charles R. Collins, Corps Topographical Engineers, and 

 Mr. J. R. P. Mechlin, of this city, in the aid they have given in the computation of 

 scientific data and the draughting of the maps and profiles which accompany my 

 report. 



I should also fail in my obligations did I not bring to the notice of the War De- 

 partment the very valuable assistance I received in the prosecution of my duties in 

 the field from Lieut. Alexander Mimy, Tenth Infantry, the commander of the escort 

 accompanying the expedition. Lieutenant Murry is an officer of great energy, and 

 zealous in the promotion of the best interests of the service ; and it is a gratification 

 to me to present him thus honorably to the consideration of the Government. 

 I have the honor to be, sir, very respectfully, your obedient servant, 

 J. H. Simpson, 

 Captain Carps Topographical Engineers, United States Army. 

 Col. J. J. Abert, 



Chief Corps Topographical Engineers. 



