In a previous paper (Padevet, 1984), the author pointed out the decisive role of thermal motions of air particles in the continuous medium behind a shock wave for fireballs. Nevertheless, the change in quality of the mechanism of momentum and energy transfer had practically no effect on the values of the transferred quantities. It was found that the role of thernal motions of particles of meteoric material becomes distinctly manifest only if the interaction of the atmosphee with the ablated meteoric material is considered. This may explain some of the observed phenomena, e.g. the "mass paradox", or the photographed fragmentation of fireballs. It also appears probable that all four groups of fireballs, I, II, IIIA, IIIB, determined earlier, can be assigned to known types of meteorites, in particular to chondrites of four known types, viz H, L, CM and CI. However, the theory of fireballs in a continuous medium should be further developed in several directions, as pointed out by the author in the discussion.