to be published) from which it appears that the ''missing-mass" data are perfectly compatible with bubble-chamber results. No questions such as the above have existed with the A 2 meson; the original experiments indicated a two-bump signal which became amplified when the events were increased and it now appears to us as an established effect to study. 2 M. L. Goldberger and K. M. Watson, Phys. Rev. 136, B1472 (1964.^K. E. Lassila and V. Ruuskanen, Phys. Rev. Letters 17, 490 (1966). 4 A. H. Rosenfeld, A.