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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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Measurements have been made on 753 four-prong events obtained by exposing the Brookhaven National Laboratory 20-in. liquid hydrogen bubble chamber to 2.85-Bev protons. The partial cross sections observed for multiple meson production reactions are: pp-\-(p-\-p -•> p J rp J rir + -\-ir~), 2.67±0.13; pn-\--\-, 1.15±0.09; pp-\-0, 0.74±0.07; ir + -\-ir~-\-p is derived using an expression from the one-pion exchange model of Drell.