  We describe a way of interpreting the chaotic principle of (ref. [GC1]) more
extensively than it was meant in the original works. Mathematically the
analysis is based on the dynamical notions of Axiom A and Axiom B and on the
notion of Axiom C, that we introduce arguing that it is suggested by the
results of an experiment (ref. [BGG]) on chaotic motions. Physically we
interpret a breakdown of the Anosov property of a time reversible attractor
(replaced, as a control parameter changes, by an Axiom A property) as a
spontaneous breakdown of the time reversal symmetry: the relation between time
reversal and the symmetry that remains after the breakdown is analogous to the
breakdown of $T$-invariance while $TCP$ still holds.
