We regret the following typographical errors in the letter by W. B. Lewis published last month: The name “Leland” should be “Lenard” and “Lamour” should be “Larmor.” In the next‐to‐last paragraph, “…from this theory (by then current)…” should be “…from this by theory (then current)….” In the last paragraph, “…distribute as in…” should read “…distribute as if…”.

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