In a previous communication to the Society the occurrence of wireless echo doublets was described and was provisionally attributed to the influence of the earth's magnetic field on the dispersive properties of the ionosphere. A more extended study of the subject, which has included an experimental determination of the polarizations of the doublet-components, has confirmed this hypothesis. In South-east England, for ionospheric reflection at vertical incidence, the echo-component of lesser delay is, in general, of right-handed, and the component of greater delay of left-handed, circular polarization, but this temporal sequence should be reversed in the Southern Hemisphere, and in certain special circumstances in the Northern Hemisphere.

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PACS. 13.40. -Electromagnetic processes and properties. PACS. 11.30. -Symmetry and conservation laws.Abstract. -SU(3) breaking mechanisms for pseudoscalar-meson charge radii are discussed and confronted with the data. These mechanisms are compatible with Sirlin's theorem, but differ in more specific predictions. The present data tend to support constituent-quark model ideas for S U(3) breaking rather than traditional vector meson dominance or recent chiral perturbation theory approaches.

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