1. (12) Tocher . Variations in the Composition of Milk (1925), p. 130.
2. Use of water by cultivated plants in the field
3. (9) Tocher . Variations in the Composition of Milk (1925), p. 48.
4. (5) Ministry of Agriculture and Fisheries. Misc. Pub. No. 65 (1929).
5. (10) Ingle . Manual of Agricultural Chemistry (1920), p. 356.