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The Sir John Herschel Collection
The preparation of the print Calendar of the Correspondence of Sir John Herschel (Michael J. Crowe ed., David R. Dyck and James J. Kevin assoc. eds, Cambridge, England: Cambridge Univ. Press, 1998, viii + 828 pp) which was funded by the National Science Foundation, took ten years. It was accomplished by a team of seventeen professors, visiting scholars, graduate students, advanced undergraduates, and staff working at the University of Notre Dame.
The first online version of Calendar was created in 2009 by Dr Marvin Bolt and Steven Lucy, working at the Webster Institute of the Adler Planetarium, and it is that data that has now been reformatted for incorporation into Ɛpsilon.
Further information about Herschel, his correspondence, and the editorial method is available online here: http://historydb.adlerplanetarium.org/herschel/?p=intro
No texts of Herschel’s letters are currently available through Ɛpsilon.
[A. J.] Ellis was correct; JH used earlier version of proof by [C. F.] Gauss in Theoria Motus Corporum Coelestium [1809] and was not aware of newer proof. But Ellis's objection to JH's proof applies only to properties of space.
Thanks for sending the note of A. J. Ellis. Comments on this and his own apparent mistake. Pleased to hear that the invalid is progressing. Their potato crop has an attack of the blight.