Notice anything interesting about this picture?

This photograph was taken of an ecology class on a field trip in 1923. The professor (3rd from left) is Henry Chandler Cowles ("father of American plant ecology").

All the students are women; in fact, if you look through other photographs of Cowles field trips, you'll see that many of the students are female. However, few went on to careers in science.

Photograph is from the Library of Congress (American Environmental Photographs Collection, [AEP Image Number -ILP243], Department of Special Collections, University of Chicago Library).