1. Preston, R. D., et al., Nature, 162, 665 (1948).
2. Frey-Wyssling, A., et al., Experientia, 6, 12 (1948). Roelofsen, P. A., Biochim. Biophys. Acta, 3, 518 (1949). Hodge, A. J., and Wardrop, A. B., Nature, 165, 272 (1950). Mühlethaler, K., Ber. Schweiz. Bot. Ges., 60, 614 (1950). Preston, R. D., “Molecular Architecture of Plant Cell Walls” (Chapman and Hall, 1952). Myers, A., Preston, R. D., and Ripley, G. W., Proc. Roy. Soc., B, 144, 450 (1956). Cronshaw, J., Myers, A., and Preston, R. D., Biochim. Biophys. Acta, 27, 89 (1958).
3. Preston, R. D., and Ripley, G. W., Nature, 174, 76 (1954). Balashov, V., and Preston, R. D., ibid., 176, 64 (1955). Honjo, G., and Watanabe, M., ibid., 181, 326 (1958). (See also Ellis, K. C., and Warwicker, J. O., ibid., 181, 1614 (1958).)
4. See Sjöstrand, F. S., and Rhodin, J., “Electron Microscopy”, Proceedings of the Stockholm Conference, 1956 (Almgvist and Wiksell, Stockholm, 1957).
5. Ribi, E., Exp. Cell Res., 5, 161 (1953). Mühlethaler, K., Zeit. Zellforsch., 38, 299 (1953). Liese, W., and Fahnenbrock, M., Holz als Roh-u. Werkstoff, 10, 197 (1952); Holzforsch., 7, 97 (1953). Liese, W., and Johann, I., Planta, 44, 269 (1954). Liese, W., Naturwiss., 7, 240 (1957); Ber. deut. bot. Ges., 52, 21 (1957). Asunmaa, S., Svensk Papperstidning, 2, 1 (1955). Frei, E., and Preston, R. D., J. Exp. Bot., 8, 139 (1957).