[Attendant stroking lower belly of newborn rabbit with rubber tab to induce first elimination, Laboratories of Bacteriology at the University of Notre Dame, Indiana]

[dead mouse and its impression in two petri dishes]

[Baby chick in jar being fed deficient diet to determine which vitamins essential to its survival, Laboratories of Bacteriology at the University of Notre Dame, Indiana]

[Unidentified Man and Woman in Blackface]

[Dr. Ernest Ceriani consulting with an elderly female patient.]

[flowing hot liquid , power lines and steam, truck and industrial shovel, locomotive on tracks]

Paul Robeson

[Unidentified Band]