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    SPECTROSCOPIC MEASURES OF PLANETARY VELOCITIES.—A new feature in the application of the Doppler-Fizeau principle has been recently brought forward by M. Deslandres (Comptes rendus, Feb. 25). It is to the effect that when we observe the spectrum of a body shining by reflected light the displacement of the lines due to movements in the line of sight depends upon the movement of the body with respect to the original source of light, as well as on its movement with regard to the observer.

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