  The classical Lorenz system is considered. For many years, this system has
been the subject of study by numerous authors. However, until now the structure
of the Lorenz attractor is not clear completely yet, and the most important
question at present is to understand the bifurcation scenario of chaos
transition in this system. Using some numerical results and our bifurcational
geometric approach, we present a new scenario of chaos transition in the
classical Lorenz system.
