COMMISSION 



TO WHICH THIS MEMOIR HAS BEEN REFERRED. 



Capt. A. A. Humphreys, U. S. A., 

 Capt. A. W. Whipple, U. S. A. 



Joseph Henry, 



Secretary S. I. 



c.or.nNs, ntiNTFK, 

 riirr.AOF.i.riiiA. 



