i.e. a fixed-angle (0) power-law dependence. The exponent ~V, which gives the energy dependence, varies from 6 to 12, depending on the specific reaction and on the model (1). However, for the scattering on protons of particle and antiparticle, respectively, the energy dependence is the same. In the specific constituent-interchange model of GvNIo~, BRODSKY and BLA~K~NBECLER (2), where the baryon is primarily considered as a bound state of a quark and a spin-one core-thus favouring quark-interchange processes--, the exponent N takes the value 7 for photoproduction on nucleons, 8 for T:p and Kp elastic scattering and 12 for pp and ~p elastic scattering. The absolute value of the cross-section is, however, not predicted. The same result for the exponent 2V is given by MATV~EV, MURADYAN and TAVKH~LIDZE (~). Furthermore, the angular dependence, given by ](0) in (1) is described as a simple and well-defined function of z ~ cos 0 .... . The model has been rather successfully tested on experimental results on pp, ::• and K~p elastic scattering (1,4), and also on some two-body hadronic reactions involving K~ (5).