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B.O. Peirce is from a different progeny, as was G. W. Pierce, also a Harvard scientist. B.O. Peirce was not a quaternion enthusiast, as were James Mill Peirce and his father Benjamin.Rgdboer (talk) 21:29, 15 June 2008 (UTC)
Thanks, it's clear now; they were second cousins once removed (i.e. Benjamin's great-grandfather Jerathmiel was Benjamin Osgood's great-great-grandfather), and the four of them (Benjamin, Benjamin, Benjamin Osgood 2nd and James Mill) were all at Harvard (according to http://books.nap.edu/html/biomems/bpeirce.pdf). I can't understand now why I didn't guess that. Thanks again for the swift reply --catslash (talk) 22:16, 15 June 2008 (UTC)