INTERACTIONS OF STRINGS AND D-BRANES FROM M-THEORY

We discuss the relation between M theory and type II string theories, We show that, assuming ''natural'' interactions between membranes and fivebranes in M theory, the known interactions between strings and D-b ranes in type II string theories arise in appropriate limits. Our disc ussion of the interactions is purely at the classical level. We remark on issues associated with the M theory approach to enhanced gauge sym metries, which deserve further investigation.