From a sample of 98 hyperon production events observed in a liquid hydrogen bubble chamber the partial cross sections for various final states are found to be: 2 + iT%-0.047,i:^7r 0 -0.011, (A°2°)i^7r + -0.014, (AW)K + mr + -0.002, all in millibarns. For the first four processes the values are in general agreement with those calculated by Ferrari using a one-pion-exchange model. Only one example of impair production was observed, indicating a cross section less than 0.01 mb.

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A study of antiproton-proton collisions at 3.3 and 3.7 BeV/c indicates that (41±4)% of the total inter action cross section can be attributed to annihilation into pions. The average pion multiplicity is 6.5±0.5. The positively charged pions and dipions tend to be emitted backward, while the negatively charged pions and dipions tend to be emitted forward in the center-of-mass system. Although there is a substantial amount of resonance production, especially of p and of o> mesons, there is no clear evidence for double or associated resonance production in these final states. A search for new resonances as well as for some of the recently discovered mesons proved unsuccessful.