Abstract
FROM a pair of photographs of the comet taken on the night of April 29–30, 1957, through a ‘Polaroid&’ filter with the 50-cm. Zeiss triplet of the Mond Astrograph, percentage polarization in integrated light (spectral range, 4000–5900 A.) has been measured in the brightest part of the coma, and also at two locations in the tail 4 and 5 min. of arc respectively from the former position. The small scale of the photographs (6.85 min. of arc/mm.) prevented any attempt at a more detailed survey.
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