PREFERENCES AND EXCEPTIONS IN ORGANIC CRYSTAL PACKING MODES Vitaly K. Belsky, L. Karpov Institute of Physical Chemistry, Moscow, 103064, Russia.

1. A glimpse at the problems history (Kitaygorodsky's theory of close packing, earlier attempts to systemize the organic crystals data).

2. The concept of structural class (SC) as a unity of crystals of the same space group and the same list of systems of equivalent positions (orbits), occupied by molecules - base for statistical treatment of organic homomolecular crystals.

3. The analysis of the distributions by SC, categories, space groups, chiral types etc.

4. The elite and monstrous modes of organic molecules packing.

5. Multisystem crystals and supersymmetry.

6. Tendencies in distributions data.

7. Molecular own symmetry, pseudosymmetry and orbits symmetry (symmetry of position).

8. What is all this for?