by John Donkey. (Samuel C. Upham)
This flippable image decorates the back cover of Gasology.
The Author At Home.
Here, Upham has cribbed E. Rogers' drawing from an 1861 piece, published by Upham, called Jeff Davis Going to War/Jeff Davis Returning from War. This is possible because the original drawing doesn't resemble Jefferson Davis at all and since the subject is already a donkey the direction of the transformation can be reversed.