  In recent papers Benzi et al. presented experimental data and an analysis to
the effect that the well-known "2/3" Kolmogorov-Obukhov exponent in the
inertial range of local structure in turbulence should be corrected by a small
but definitely non-zero amount. We reexamine the very same data and show that
this conclusion is unjustified. The data are in fact consistent with incomplete
similarity in the inertial range, and with an exponent that depends on the
Reynolds number and tends to 2/3 in the limit of vanishing viscosity. If
further data confirm this conclusion, the understanding of local structure
would be profoundly affected.
