Abstract
It is suggested the Bowen's meteor hypothesis has special relevance in the Southern Hemisphere, because of its comparatively small area of land and the fairly slow interhemispheric exchange of air. The latter is discussed in the light of tritium measurements in Rhodesian rain. The existence of calendar singularities is established in Rhodesian rainfall records, the pattern repeating itself in the hail records of years which do not overlap those used for the rainfalls. Salisbury and Bulawayo derive almost coincident peaks with rain falling in completely different years, indicating that a secondary rather than primary weather mechanism is responsible for some of the singularities. Others are associated with pressure fluctuations over South Africa.
