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Rh departure, containing 399 short rules by which to foretell changes in the weather by the appearance of the sky, the sun, moon, and stars, or by the behaviour of animals. In the absence of the author, the introduction was written in his name by his fellow-student, Longomontanus, at the dictation of Tycho. In this it is stated that King Frederick took a great interest in weather prognostications, and had desired Tycho Brahe, from books and his own experience, to compile a treatise on the subject, but as Tycho had other and more important work to look after, he had requested Flemlöse to do so. It is not said whether the author had collected his materials at Hveen, but most of the rules contained in the book are chiefly such as farmers and similar observers might imagine they had deduced from their experience, and here and there it affords curious reading, at least to a modern student.

Another of the early assistants of Tycho was a German, Paul Wittich, from Breslau, whose name, but for his early death, would probably be much better known in the history of astronomy than it is. He had been recommended by