1. Cooke, G. B., Cork and the Cork Tree, 24 (Pergamon, Oxford, 1961).
2. Cartwright, K. St. G., and Findlay, W. P. K., Decay of Timber and its Prevention, 264 (H.M.S.O., London, 2nd ed., 1958).
3. Marsh, R. W., and Walker, M. M., J. Pomol., 10, 71 (1932).
4. Thomas, H. E., J. Agric. Res., 48, 187 (1934).
5. Gaumann, E., Principles of Plant Infection, 44 (Crosby Lockwood, London, 1950).