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I have apologized privately to Prof. Perry—and do so again publicly—for my incorrect notation about her speech and my lack of precise citation. I was unaware of the published article, but had heard the speech at a regional AAS conference. I made assumptions about its nature (not its content) that I should not have done.

I do not wish to elaborate here on our different ways of framing historical arguments and questions. Over many years, I have been an admiring reader of Prof. Perry's impressive corpus of work, even as I have disagreed with elements of it (as is normal…