. The genetic and the operative evidence relating to secondary sexual characters. Sex (Biology); Heredity; Poultry. . Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Morgan, Thomas Hunt, 1866-1945. Washington, Carnegie institution of Washington

---

Size: 1419px × 1762px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookdecade1910, booksubjectpoultry, bookyear1919