1. CAIN, S.A., Size-frequency studies of Pinus palustris pollen, ECOLOGY 25: 229 (1944).
2. Cain S. A. in press.
3. Dice, L. R., A Graphical Method for Comparing Several Sets of Measurements: 1 (1936).
4. Friesner, R. C., Butler University Botanical Studies 8: 24 (1946).
5. Munns, E. N., U. S. Department of Agriculture Miscellaneous Publication 287: 1 (1938).