  Cosmic rays propagating in the Galaxy may excite a streaming instability when
their motion is super-alfvenic, thereby producing the conditions for their own
diffusion. We present the results of a self-consistent solution of the
transport equation where diffusion occurs because of the self-generated
turbulence together with a preexisting turbulence injected, for instance, by
supernova explosions and cascading to smaller scales. All chemicals are
included in our calculations, so that we are able to show the secondary to
primary ratios in addition to the spectra of the individual elements. All
predictions appear to be in good agreement with observations.
