1. Albert, Z., Orłowski, M., and Szewczuk, A., Nature, 191, 767 (1961).
2. Glenner, G. G., and Folk, J. E., Nature, 192, 238 (1961).
3. Glenner, G. G., Folk, J. E., and McMillan, P. J., J. Histochem. Cytochem., 10, 481 (1962).
4. Albert, Z., Orłowska, J., Orłowski, M., and Szewczuk, A., Acta Histochemica (in the press).
5. Albert, Z., Orłowska, J., and Orłowski, M., Acta Histochemica (in the press).