  We present in this paper a calculation of the average proton-nucleus
inelasticity. Using an Iterative Leading Particle Model and the Glauber model,
we relate the leading particle distribution in nucleon-nucleus interactions
with the respective one in nucleon- proton collisions. To describe the leading
particle distribution in nucleon-proton collisions, we use the Regge Mueller
formalism.
  Contribution to 26th ICRC - Salt Lake City, Utah. August, 1999.
  HE 1.1.14
