1. Quay, W. B., J. Morph., 98, 471 (1956).
2. Gray, J. H., J. Anat., 69, 153 (1935).
3. Torsegno, M. E., Note Riv. Psichiat., April, 215 (1935) cited by Selye, H., The Mast Cells (Butterworths, 1965).
4. Neumann, J., Virchows Arch. Path. Anat. Physiol., 122, 378 (1890).
5. Kellsall, M. A., and Lewis, P., Fed. Proc. Fed. Amer. Soc. Exp. Biol., 23, 1107 (1964).