Portrait of Hyde at approximately 30 years old.

Portrait of Hyde at approximately 30 years old.

Portrait of Emmott at approximately 50 years old wearing academic robe.

Portrait of Brooks at approximately 61 years old, a subject in the "Original Faculty of Philosophy" mural located in Shriver Hall.

Portrait of Brooks at approximately 61 years old, a subject in the "Original Faculty of Philosophy" mural located in Shriver Hall.

Portrait of Blanc at approximately 35 years old.

Candid photograph of Stewart at approximately 50 years old, standing in the original Chemistry building, Johns Hopkins University's original campus.

Candid photograph of Stewart at approximately 50 years old, leaning on a rail outside the original Chemistry building, Johns Hopkins University's original campus.

Portrait of Wood at approximately 60 years old, a subject in the "Original Faculty of Philosophy" mural located in Shriver Hall.

Portrait of Kennedy at approximately 25 years old.