1. awl , 1807, quoted by Sweetman, Maine Agrie. Expt. Sta. Bull. 383, 1930, and by Olyiuie and Jackson, ref. 4.
2. and , 1897, quoted by Clynne anil Jackson, ref. 4.
3. The distribution of dry matter and nitrogen in the potato tuber. Variety, King Edward
4. “The Potato,” Lippiucott, U.S.A., 1937, p. 368.