In this paper, we propose a physical model leading-to the causal interpretation of the quantum theory. In this model, a set of fields which are equivalent in many ways to a conserved Quid, with density~P~, and local stream velocity, dg/dt = ryS/ns, act on a particle-like inhomogeneity which moves with the local stream velocity of the equivalent Quid. By introducing the hypothesis of a very irregular and e6ectively random Quctuation in the motions of the Quid, we are able to prove that an arbitrary probability density ultimately decays into~P~. Thus, we answer an important objection to the causal interpretation, made by Pauli and others. This result is extended to the Dirac equation and to the many-particle problem.

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We conclude that hydrodynamics has a determinant effect on the efficacy and that the adjunction of an intermittent component in the flow increases it. Flow type and the time interval between 2 boluses are the 2 critical variables.