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In this paper we shall investigate the possibility of steady, plane gas flows having streamlines which can be mapped conformally onto a family of parallel lines. We shall limit our consideration to flows of an ideal gas (that is, a nonviscous, thermally nonconducting gas with constant specific heats) in the absence of body forces. The investigation will include rotational as well as irrotational flows. We shall employ the formulation of the basic gas flow equations due to Munk and Prim [ l ] . 1 This formulation includes the most general steady flows of an ideal gas in the absence of body forces.

On the existence of steady gas flow in plane isothermal streamline patterns