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the planet became serious. In 1821 Bou-
vard undertook a revision of the tables, but
found it impossible to reconcile all the ob-
servations of 130 years (the period of revo-
lution of Uranus is eighty-four years). So
he deliberately rejected the old ones, ex-
pressing the opinion that the discrepancies
might depend upon ”some foreign and un-
perceived cause which may have been act-
321
