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 of the instrument, it did not appear like a ring, but Saturn looked like a triple star. Galileo, who on the one hand did not wish to make the new discovery public until he had sufficiently observed it, yet feared on the other that some one might claim priority, at once communicated it in a letter from Padua, 30th July, 1610, to his influential friend Belisario Vinta, chief secretary of state to Cosmo II., but urgently begged him to keep it a secret. But even this did not seem sufficient to secure his right to the first observation of Saturn, so he announced it to his friends in the following absurd anagram:—

Kepler puzzled for a long time over this enigma, and at last only made out the barbaric line, "Salve umbistineum geminatum Martia proles," which he incorrectly applied to the planet Mars. At length, after repeated requests, and after Julian de' Medici, Tuscan ambassador at the Imperial court, had been charged by the Emperor to ask for a solution, he complied with the illustrious wish, and in a letter to Julian of 13th November, 1610, gave the following startling explanation:—

The learned and semi-learned world of Italy had not yet had time to become reconciled to the surprising discoveries announced in the "Sidereus Nuncius" of March in the same year, when the asserted triple nature of Saturn contravened the prevailing idea that there was nothing new to be discovered in the heavens. The recognition of Galileo's telescopic discoveries made way very slowly. From the first he spared no pains in popularising them. He did this repeatedly in public lectures, and with so much success that he could write to Vinta: "even the most exalted personages, who have been most vehement in attacking my doctrines, at