We present a study of antineutrino interactions in hydrogen obtained in a 138000-picture run at the BNL 7-ft bubble chamber. The antineutrino beam had an energy distribution that peaked at -1.1 GeV. The cross section measured for charged-currect interactions is cr(i7p + p C + anything) = (0.32 + 0.08) x X [E; (GeV)] cm2. The neutral-current cross section is a ( i 7 p -C p r C r -) = 5.5::; x cm2. The ratio of strangeness-changing to non-strangeness-changing charged currents is R, = 0.06' ;:;:.An upper limit determined for charm production is u, < 3.8 X cm2 at the 90% confidence level. From the momentumtransfer distribution we measure average Q 2 for inelastic charged-current events with energy greater than 2 GeV,

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