The negative-pion multiplicity is measured for central collisions of 40 Ar with KC1 at eight energies from 0.36 to 1.8 GeV/nucleon and for 4 He on KC1 and 40 Ar on Bal 2 at 977 and 772 MeV/nucleon, respectively. A systematic discrepancy with a cascade-model calculation which fits proton-and pion-nucleus cross sections but omits potential-energy effects is used to derive the energy going into bulk compression of the system. A value of the incompressibility constant of if =240 MeV is extracted in a parabolic form of the nuclear-matter equation of state.
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