1. Stocking, C. R., Ency. Plant Physiol., 3, 15 (1956).
2. Kramer, P. J., Ency. Plant Physiol., 1, 194 (1955).
3. Kramer, P. J., Ency. Plant Physiol., 1, 223 (1955).
4. Crafts, A. S., Currier, H. B., and Stocking, C. R., Water in the Physiology of Plants (Chronica Botanica Co., 1949).
5. Levitt, J., Ency. Plant Physiol., 2, 584 (1956).