15. PHYSICAL STUDY OF COMETS, MINOR PLANETS AND METEORITES (L'fcTUDE PHYSIQUE DES COMETES, PETITES PLANETES ET DES METEORITES) PRESIDENT: A. H. Delsemme. VICE-PRESIDENT: N. B. Richter. SECRETARY: J. Rahe. ORGANIZING COMMITTEE: E. Anders, C. Aipigny, L. Bieimann,