April, page 15—The first sentence in the letter titled “Monopole debate” should have read “I was dismayed to find a statement in your October issue to the effect that ‘…Julian Schwinger…developed a consistent field theory of monopoles’.” The word “field” was omitted also in the version seen by the two respondents.

The June 1976 cover note should have included the following credit line: “© by the California Institute of Technology and the Carnegie Institution of Washington.” Our apologies to the permissions department of the Hale Observatories.

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