. Electron microscopy; proceedings of the Stockholm Conference, September, 1956. Electron microscopy. Gelatin in the Photographic Process 351 8), very long and thin silver filaments occur and at the same time pronounced surface structures appear on the crystal. The results show that it is possible by the carbon replica method to render tine structures of undevel- oped and developed silver halide crystals visible which were previously inaccessible to investigation. I should like to thank Prof. Friescr for the detailed discussions he held with mc upon the suhjcct in question. The electron microg
. Electron microscopy; proceedings of the Stockholm Conference, September, 1956. Electron microscopy. Gelatin in the Photographic Process 351 8), very long and thin silver filaments occur and at the same time pronounced surface structures appear on the crystal. The results show that it is possible by the carbon replica method to render tine structures of undevel- oped and developed silver halide crystals visible which were previously inaccessible to investigation. I should like to thank Prof. Friescr for the detailed discussions he held with mc upon the suhjcct in question. The electron micrographs were made by Dr. Kirchcr in the inorganic analytical laboratory of the Farbcnfabriken Bayer, Leverkusen, and I should also like to express m\ thanks to him. In addition, i am indebted to Miss ina Lehnert and Mr. Hans-Jorg Metz for valuable assistance during the experiments. Prof, von Borries always devoted his special attention to these problems and generously assisted us in dealing with them. References 1. Bradley, D. E., Brit. J. Appl. Pliys. 5, No. 2, 62 (1954). 2. Evans, T. and Mik mfll, J. W., Report ol" Bristol C"on- lercnce 1954 (409). ndects in Crystalline Solids. 3. pRrESiR, H. and Kiiin, E., Mitt. Agfa 1, I. Springer Verlag, Berlin, 1955. 4. HiixiEs, J. M. and Mit( iiii i , J. \V., Pliil. Mai;. (7), 44, 223, 357 (1953). 5. Klein, E., Mitt. Agfa 1, 10. Springer Verlag, Berlin, 1955. — Phot. Korr. 91, \19, 199 (1955). 6. Biinsentagung 1956 Freiburg. Z. Elektrocheni. 60, 998 (1956). 7. KoNiG, H. and Helwiu, G.,Z. Physik 129, 491 (1951). 8. KoMCi, H. and Knoch, M., Phys. Vi'iluimli. 2. 14 (1955). Gelatin in the Photographic Process G. Vandermeerssche, C. Maertens and G. Lion Centre de Microscopie Electroniqiie, Medical, Industriel et Agricole, Briissels-Uccle As early as 1935 Russian scientists have tried to find a practical classification for photographic gela- tins (5). This classification was based only on the value of gamma and on the sensitivity of
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