C. Ferrari: Premessa.- M.S.v. Krzywoblocki: The mathematical aspects of rarefied gas dynamics as applied to hypersonic, reentry and magneto-ggas-dynamics.- J. Kampe de Feriet: La theorie de linformation et la mecanique statistique classique des systemes en equilibre.- M. Lunc: Equations de transport.- I. Estermann: 1. Applications of molecular beams to problems in rarefied gas dynamics. 2. Experimental methods in rarefied gas dynamics.- S. Nocilla: Sullintegrazione tra flussi di molecole libere e superfici rigide.- F. Sernagiotto: Solution of Rayleigh s problem for the whole range of Knudsen...