Page:The sidereal messenger of Galileo Galilei.pdf/116

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THE SIDEREAL MESSENGER.

letters I made an uncouth verse which I inserted in my Short Account in the month of September of last year:—

Salve umbistineum[1] geminatum Martia proles.
Hail, twin companionship, children of Mars.

But I was a very long way from the meaning of the letters; it contained nothing to do with Mars; and, not to detain you, reader, here is the solution of the riddle in the words of Galileo himself, the author of it:[2]

"Di Firenze li 13 di Novembre 1610.—Ma passando ad altro, giacchè il Sig. Keplero ha in questa sua ultima narrazione stampate le lettere che io mandai trasposte a Vostra Signoria Ilustrissima e Reverendissima venendomi anco significato come Sua Maestà ne desidera il senso, ecco che io lo mando a Vostra Signoria Illustrissima per participarlo con Sua Maestà col Sig. Keplero e con chi piacerà a Vostra Signoria Illustrissima bramando io che lo sappia ognuno. Le


  1. Umbistineum. Apparently this is some German word with a Latin ending, such as um-bei-stehn; Kepler fancied that Galileo had discovered two satellites of Mars.
  2. The text of the four letters of Galileo followed here is that given in the edition of Galileo's works published at Florence, 1842-56; that in the edition of Kepler's Dioptrics, published at Augsburg, 1611, is very inaccurate. These letters were written to Giuliano de' Medici, ambassador of the Grand-Duke of Tuscany to the Emperor Rudolf ii. at Prague.