Abstract
Ritz's “ballistic” theory of light emission is outlined, and the evidence on which it has been regarded as untenable is re-examined. It is shown that the theory as presented by Ritz is indefinite, and that, when it is amended to a form consistent with the postulate of relativity of motion, it is no longer vulnerable to the earlier criticisms. The question of its admissibility is therefore open. It is pointed out that determinations of the “constant of aberration” from observations of distant nebulae might settle this question, and such determinations are recommended.

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