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Rh ,' where an Englishman might use 'sennight;' similarly, a fortnight is in Welsh pythewnos, 'a fifteen-night,' and the Irish cóicthiges (genitive cóicthigisi of the same meaning, is also derived from the name of the fifteenth numeral in its Irish form: compare the French huitaine and quinzaine respectively. This way of counting, then, was the same as that usual in music, where a third is said to consist of two tones, or whatever the description of the intervals in any given case may happen to be; so a nine-night week would contain only eight days or eight portions of daylight, and that was, I believe, the ancient week of the Aryans, at least of the Aryans of Western Europe. In Italy we have traces of it in the Roman nundinæ or markets held every ninth day: the word is supposed to represent an older and longer form, novendinæ, from the ninth numeral; and it happens that nundinæ, in a manuscript of the eighth or ninth century,