Bust-length portrait of figure turned three-quarters to the left, in front of a hazy grey-blue background, resembling a cloudy sky. The subject has dark, graying hair and sideburns, hazel eyes, and a clear, rosy complexion. He wears a dark gray coat, a white waistcoat and shirt, and a white stock, tied in a high knot. Signed and dated in the lower left corner, "Agassiz / by D. Huntington / 1857."

Three-quarter-length seated figure turned left, head resting on left hand, right hand holding manuscripts. The sitter wears a black coat and waistcoat and a white shirt. There is a red table cloth at lower right, under manuscript. Gray-brown background. Signed: "D. Huntington/1861" on lower right corner.

Depicts head, shoulders, and chest of figure, facing right, wearing dark suit, white shirt, and tie, with white hair and a beard. Inscribed "D. Huntington" on front lower left corner.