Like all of Darwin’s children, Francis helped his father from a young age. As a child he and his siblings made observations and collected plant samples. Later in life Francis, classically-educated in Latin, proved a useful source of help for Darwin’s…
Henrietta made a significant contribution to her father’s work, most notably as editor of Descent. Darwin’s correspondence suggests that she was selected as editor less for the civilizing, feminine influence she might exert on his work and more for…
Mary Treat’s 1873 article Controlling Sex in Butterflies. In January 1872, having been asked for his opinion on her research, Darwin praised Treat’s research into butterfly diet and sex and encouraged her to publish her findings.