Profile portrait of Alexander von Humboldt, with "Alexander von Humboldt/1769 - 1859" around perimeter.

Black and white photograph of half-length figure, body turned left, facing front. Figure wears shirt, vest, jacket, tie, and glasses.

Three-quarter length seated figure, body turned left, head facing forward. Wearing white summer suit, striped vest, white shirt, black four-in-hand tie. Seated on wooden chair with upholstered arms. Background of trees. Signed "M. Lesley Bush-Brown" on lower left corner.

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.

Three-quarter length portrait of a seated figure in a red, upholstered armchair, the body turned slightly to the right. Both hands are in the subject's lap; he holds an open book with his left hand and a pair of spectacles in his right. The subject has gray hair, gray eyes, and a pale complexion. He wears a black suit, a white collar and stock, and a vermilion scarf. On the desk to the left are three books and pages of a manuscript. A thermometer hangs on the wall in left background. Signed and dated "J.R. Lambdin / 1856" in left center of canvas, on the desk below the manuscript pages.

The sitter faces the viewer’s left in three-quarter profile. He has a broad brow and receding hairline with short, thin dark hair, and his left ear is visible. The sitter is dressed in a dark overcoat and white cravat with a bow; a small medallion decorates the left lapel of his coat. He is seated in a red chair, positioned against a modulated backdrop.

Obverse: profile portrait of Carl Friedrich Gauss; "Carolvs Fridericvs Gavss NAT. MDCCLXXVII APR. XXX OB. MDCCCLV FEB. XXIII" around perimeter. "Brehmer F." under portrait. Reverse: ivy wreath; "Georgivs V Rex Hannoverae Mathematicorvm Principi" in center and "ACADEMIAE SVAE GEORGIAE AVGVSTAE DECORI AETERNO" around perimeter.

Obverse: profile portrait of Carl Friedrich Gauss; "Carolvs Fridericvs Gavss NAT. MDCCLXXVII APR. XXX OB. MDCCCLV FEB. XXIII" around perimeter. "Brehmer F." under portrait. Reverse: ivy wreath; "Georgivs V Rex Hannoverae Mathematicorvm Principi" in center and "ACADEMIAE SVAE GEORGIAE AVGVSTAE DECORI AETERNO" around perimeter.

The sitter faces the viewer’s right in three-quarter view. He has a receding hairline with short, thin, graying hair and a prominent brow, and his right ear is visible. He is dressed in a dark overcoat and white cravat, positioned against a dark, somewhat modulated background.

Bust-length portrait with body turned to the right, in front of a gray-tan background. The subject has black hair and hazel eyes. He is wearing a black coat and stock and a white waistcoat and collar. Unsigned and undated.

Half-length figure, turned right. Wearing black coat, waistcoat, bow tie, white collar. Dull gray background. Signed "G W Pettit 1897" on lower right corner.

Three-quarter length portrait of a seated figure with body turned to the left, in front of an unfinished brown and tan background. The figure holds his head in his left hand and his right hand holds the pages of an open book. He has white, receding hair, brown eyes, and a rosy complexion. He wears a black coat with a white collar and bow, open at the throat. A pair of spectacles rests on his forehead. The figure is seated in a wooden armchair and in the lower left corner, against the chair, are three books and a portfolio, resting on a table. Unsigned and undated.

Bust-length portrait with body turned slightly to the left, in front of dark tan background. Subject has black hair, brown eyes and a rosy complexion. He is wearing a black coat and a white waistcoat and collar with the neckcloth tied in a bow. Unsigned and undated.

Portrait with head and shoulders visible; body turned three-quarters to the left, head facing center. The sitter wears a dark suit, waistcoast, and bow tie, a white shirt with gold buttons, and a gold watch chain across waistcoat. Inscribed: "H. Ulke" on front, lower right corner.

Half-length seated figure, body turned left, head leaning on left hand, left elbow on table edge. Wearing black coat, blue tie, white collared shirt, gold cuff in left arm cuff. Chair back is upholstered red, table is covered in reddish-brown fabric. Signed "Henry Ulke 1879" lower right corner. After original 1875 portrait by Ulke (National Portrait Gallery, Smithsonian Institution).

Half-length seated figure, shown in profile against a tan and brown background. The sitter wears a black suit and waistcoat, a white shirt, a maroon tie run through a ring, and a gold watch chain. Signed: "H. Ulke" in lower right corner.

Plaster death mask of a subject with full beard and moustache. The mask is a thick, hollow cast. Unsigned and undated.

Half-length figure, head turned slightly left. Wearing gray coat and waistcoat, which shirt, black cravat. Dark gray background. Possibly after 1889 portrait by Bernard Uhle, who possibly copied photograph.