Knower standing outside with a cloth napkin in his right hand.
Kofoid sitting at a table with a hand placed on a an instrument placed next to a microscope.
Lefevre standing outside in front of a brick building with a hat in his right hand.
Lewis standing in front of a building facing the camera. He is holding a vial or flask in his left hand.
Linton standing outside next to a brick building with a couple of objects in his right hand.
Loeb looking through a microscope at a table.
Loeb standing outside with a racket in a case in his right hand.
MacCallum standing outside looking at a building.
Martin standing outside next to another man.
Mast sitting outside on the steps leading up to the building.
Lillie standing outside in front of a cove.
Hartman standing in front of a wooden building with leather-like gloves on while holding an animal by the tail.