Sir Francis Galton, probably taken in the 1850s or early 1860s (labeled as “middle life” in source). Scanned from Karl Pearson’s The Life, Letters, and Labors of Francis Galton. This image is in the public domain in the United States as its copyright has expired. Courtesy of Wikimedia Commons: https://commons.wikimedia.org/wiki/File:Francis_Galton_1850s.jpg
