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In a recent Note1 the present author discussed the application of the linear-perturbation theory to the subsonic flow of a compressible fluid past a slender bod of revolution. It was shown that the several variants of the theory2'3,4'6,6 lead to inconsistent results when applied, for example, to the flow about ellipsoids of revolution, and it was stated that this ambiguity results from applying the theory to a case that is essentially nonlinear. It was implied that all the variants are equally valid so far as the first-order theory is concerned. • , In the present Note it will be shown that the various procedures are not, in fact, equally acceptable, and that only one of them, in which the boundary condition is properly satisfied, can be considered to be correct, even to the first order. The boundary-value problem involved is the following:

A second note on compressible flow about bodies of revolution