The concept of duality is applied to the real part of K+p scattering. We study this part of the amplitude via fixed-t dispersion relations. We are interested in seeing what effect replacing the left-hand discontinuities (K-p scattering) by a low-energy extrapolation of Regge-pole amplitudes will have on the real part or the right-hand side (K+p scattering). © 1973 The American Physical Society.