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374 lished in 1668 a critique of it, showing the errors in the observations of 1582, and announcing the forthcoming correct edition. Bartholin furthermore compared a copy of the Historia Cœlestis (bound in two volumes) with the originals, and entered in it all the corrections and smaller omissions, while he in a third volume had the observations previous to 1582, the longer omissions, the year 1593, and the observations of comets, carefully copied and compared with the originals. In 1669 he caused inquiries to be made from Blaev, in Amsterdam, about the printing of the new edition, which Blaev seemed disposed to undertake.

Unfortunately, King Frederick III. died in 1670, and as his son and successor took no interest in literature or science, there was an end to the prospect of a correct edition of Tycho Brahe's observations. In the following year Picard came to Copenhagen to determine the geographical position of Uraniborg, and on learning how matters stood, he begged and obtained leave to take Bartholin's copy back with him to Paris to have it printed at the expense of Louis XIV. For the sake of control during the printing, the originals were handed to Bartholin's assistant, Ole Römer, whom Picard had persuaded to go with him to France. The printing was commenced at Paris, but Louis XIV.'s wars required money, and the undertaking was eventually stopped. Inquiries were made for the original manuscripts by the Danish Government in 1696, and they were found in charge