1. Estable, C., and Sotelo, J. R., Public. Inst. Invest. Sci. Biol., Buenos Aires., 1, 105 (1951); in “Fine Structure of Cells”, 170, Eighth Internat. Congr. Cell Biol. (Leyden, 1955).
2. Bernard, W., Haguenau, F., and Oberling, C., Experientia, 8, 58 (1952); also Bernard, W., Haguenau, F., Oberling, C., and Rouille, in Serra, J. A., “Fine Structure of Cells”, “Encycl. of Plant Physiol.”, 1, 445 (Springer, Heidelberg, 1955).
3. Cf. Tramezani, J. H., and Valeri, V., in “Symposium on Cell Secretion”, 68 (Belo Horizonte, Brazil, 1955).
4. Lettré, R., in “Fine Structure of Cells”, 141, Eighth Internat. Congr. Cell Biol. (Leyden, 1955).
5. Serra, J. A., and Lopes, A. Q., Portug. Acta Biol., A, 1, 51 (1945).