Wonderful 6th Plate TT of Lt Edwin B Bartlett of the 10th Mass Infantry seated alongside a Hospital Steward showing his Cadeusis insignia on sleave along with a Circular Badge with Star in Center on his breast.  Bartlett's kepi has a 6th Corps Badge on it.  Bartlett's photo is published in the Civil War Database and probably in the Mollus collection.   Bartlett was killed during the Spottsylvania Campaign.  
 
Edwin B. Bartlett
Residence Springfield, MA; a 22-year-old Clerk.
Enlisted on 5/31/1861 as a Corpl.
On 6/21/1861, he mustered into "F" Co. Massachusetts 10th Infantry.
He was Killed on 5/18/1864 at Spotsylvania Court House, VA
Promotions:
Sergt
Sergt Major 7/1/1862
2nd Lieut 9/29/1862
1st Lieut 11/26/1862 (As of Co. B)
Intra-regimental company transfers
7/1/1862 From company F to Field & Staff
9/29/1862 From Field & Staff to company F
11/26/1862 From company F to company B
 
Sources used by Historical Data Systems, Inc.:
Massachusetts Soldiers, Sailors and Marines in the Civil War
Photo courtsey of Duane Bliss