The Rudimental Copulatory Organ of the Male Domestic Fowl by Professor Dr. Kiyvoshi Masui, Assistant Professor, Agricultural Department, Tokyo Imperial University, Japan. The South African Poultry Magazine, May, 1929.

The male copulatory organ of the duck has already been described by many authors, but, as far as we are aware, none of the investigators have shown the existence of the same organ in the domestic fowl.