Abstract
Sigma Scorpii.—Popular Astronomy for November contains a note by Mr. B. H. Dawson on an occulta-tion of this star that he observed at La Plata on July 25. The disappearance was in two sharp steps, at intervals of less than half a second. More than half the light was cut off at the first step. Señor Dartayet made identical notes, using another telescope 50 metres distant. The note recalls similar observations made during occupations of the same star on March 12, 1860 (Cape), and April 10, 1917 (Washington). Mr. Dawson points out that a separation of the pair by about a tenth of a second of arc is indicated. This is too large for the spectro-scopic system, which has a period of 33 days. M. Henroteau had already suggested the presence of another component, with a period of about twelve years; the phenomena noted during occultations support this suggestion.
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