  We analyze spin dependent parton distributions consistent with the most
recent measurements of the spin dependent deep inelastic scattering structure
functions and obtained in the framework of the spin dilution model. Predictions
for the doubly polarised proton-proton Drell-Yan asymmetry, for the high
$p_{T}$ photon production mechanism and $J/\Psi$ excitation are calculated
using these distributions and are shown to be particularly adequate to unveil
the polarisation of partons in the proton.
