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This paper is concerned with a simple phenomenological discussion of gaseous combustion through a tube and related phenomena involving hydrodynamic, thermodynamic, and chemical considerations. It is also indicated how the discussion can be conveniently developed into a treatment from the point of view of microscopic chemical kinetics. Indeed, some interesting results are already obtained without such an extension. For instance, when there is no chemical reaction, it is found that for the range of Mach Numbers of flow l/\/y < M < 1 in the subsonic region, the temperature of the gas is actually decreasing while external heat is being added. It is also shown'that, by continuous heating, both subsonic flows and supersonic flows will eventually approach the sonic state. When 1

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