1. R. Armenteros, A. Astier, C. D’Andlen, B. Gregory, H. Hendel, J. Hennessy, A. Lagarrigue, L. Leprince-Ringuet, F. Muller, Ch. Peyrou etR. Rau: Report of the Pisa Conference on Elementary Particles, June 1955, to be published inNuovo Cimento.
2. For a theoretical treatment of such problems see the following letter byR. Gatto.
3. J. Crussard, V. Fouché, T. F. Hoang, L. Jauneau, G. Kayas, L. Leprince-Ringuet, O. Morellet, A. Orkin-Lecourtois, F. Renard etJ. Trembley: Report of the Pisa Conference on Elementary Particles, June 1955, to be published inNuovo Cimento.
4. F. Anderson, G. Lawlor T. E. andNevin: Report of the Pisa Conference on Elementary Particles, June 1955, to be published inNuovo Cimento.
5. M. V. Friedlander; private communication.