1. Arbesman, C. E., Rose, N. R., Kantor, S. Z., and Beede, R. B. (1960). J. Allergy, 31, 317.
2. Bohme, D., Paal, G., Kersten, W., and Kersten, H. (1963). Nature (Lond.), 197, 609.
3. Symposium on Organ Culture;Bornstein, M.B.;Nat. Cancer Inst. Monogr. No,1963
4. Boyden, S. V. (1951). J. exp. Med., 93, 107.
5. Buchanan, W. W., Crooks, J., Alexander, W. D., Koutras, D. A., Wayne, E. J., and Gray, K. G. (1961). Lancet, 1, 245.