Photo of Thomas Hunt Morgan, signed and dated May 30, 1920.
Thomas Hunt Morgan with microscope.
Morgan at microscope.
Morgan at his desk at Columbia, 1920.
Thomas Hunt Morgan in the Fly Room at Columbia (2), 1917.
Thomas Hunt Morgan in the Fly Room at Columbia, 1917.
A meeting between Hugo de Vries and Thomas Hunt Morgan.
Thomas Hunt Morgan (1933 winner of the Nobel Prize for Medicine for his work on the chromosomal theory of inheritance), with his daughters, Isabel (left) and Lilian (right), 1920.
A description of the "Chromosome debate" that took place during Morgan's time.
Summary of the Chromosome "theory" pre-Morgan.