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Rh we still possess a couple of observations from the 14th of that month. The lunar eclipse of the 8th December, which he had computed in the book on the new star, was duly observed, and he was on that occasion assisted by his youngest sister Sophia, at that time a girl seventeen years of age, highly educated, and not only conversant with classical literature, but also well acquainted with astrology and alchemy, and therefore in every way fit to assist her great brother. She was the only one of his relations who showed any sympathy with his pursuits, and was a frequent visitor in his home. In March, April, and May 1574 Tycho observed at Heridsvad, but the remaining part of the year he chiefly spent at Copenhagen, where his daughter Magdalene was born. In the capital his rising fame had now attracted considerable attention, and some young nobles who were studying at the University requested him to deliver a course of lectures on some mathematical subject on which there were no lectures being given at that time. His friends Dancey and Pratensis urged him to consent to this proposal, but Tycho was not inclined to do so, until the King had also requested him to gratify the wishes of the students, and at the same time to give the University a helping hand. He then yielded, and the lectures were commenced on the 23rd September 1574, with an oration on the antiquity and importance of the mathematical sciences. This was printed after his death, but has long ago become very scarce, for which reason we shall give an abstract of the contents.