  We apply a recently developed scaling procedure to the analysis of
equilibrium magnetization M(H) data that were obtained for T-2212 and
Bi-2212single crystals and were reported in the literature. The temperature
dependencies of the upper critical field and the magnetic field penetration
depth resulting from our analysis are distinctly different from those obtained
in the original publications. We argue that theoretical models, which are
usually employed for analyses of the equilibrium magnetization in the mixed
state of type-II superconductors are not adequate for a quantitative
description of high-Tc superconductors. In addition, we demonstrate that the
scaled equilibrium magnetization M(H) curve for a Tl-2212 sample reveals a
pronounced kink, suggesting a phase transition in the mixed state.
