1. Ratcliffe, D. A., Bird Study, 10, 56 (1963).
2. Lockie, J. D., and Ratcliffe, D. A., British Birds (in the press)
3. Goodwin, E. S., Goulden, R., and Reynolds, J. G., Analyst, 86, 697 (1961).
4. de Faubert Maunder, M. J., Egan, H., Godly, E. W., Hammond, E. W., Roburn, J., and Thomson, J., Analyst (in the press).
5. Evans, W. H., Analyst, 87, 569 (1962).