  The turbulent Prandtl number has been calculated in the two-loop
approximation of the $\eps$ expansion of the stochastic theory of turbulence.
The strikingly small value obtained for the two-loop correction explains the
good agreement of the earlier one-loop result with the experiment. This
situation is drastically different from other available nontrivial two-loop
results, which exhibit corrections of the magnitude of the one-loop term. The
reason is traced to the mutual cancellation of additional divergences appearing
in two dimensions which have had a major effect on the results of previous
calculations of other quantities.
