  Magnetization curves of MnSi single crystals have been measured in a range of
temperatures $T = 5.5 - 35$ K and magnetic field strengths $H \leq 11$ kOe for
$H \parallel$ [111], [001], and [110]. Special attention has been paid to the
temperature interval near $T_N = 28.8$K, where MnSi exhibits a transition to
the state with a long-period helical magnetic structure. Some new features in
the magnetic behavior of MnSi have been found. In particular, in an
intermediate temperature region above the transition (28.8 K $= T_N \leq T <
31.5$ K), the $dM(H)/dH$ curves exhibit anomalies that are not characteristic
of the typical paramagnetic state. It is established that the line of the
characteristic field $H^ \ast (T)$ of this anomaly is a natural extrapolation
of the temperature dependence of the field of the transition from a conical
phase to an induced ferromagnetic phase observed at $T < T_N$. It is concluded
that the properties of MnSi in the indicated intermediate region are related to
and governed by those of the conical phase (rather than of the A phase). Based
on these data, magnetic phase diagrams of MnSi for $H \parallel$ [111], [001],
and [110] are plotted and compared to diagrams obtained earlier by other
methods.
