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228 completion of Tycho's star-catalogue which he wished to commemorate by the striking of a medal (or rather two, slightly different) bearing the year 1595. This is quite possible, and he may have wished, in the midst of all his worry and vexation, to have a memorial of the work carried on for nearly twenty years at Hveen. A more lasting memorial of his activity and of the respect with which he was treated by any one able to value his work was the collection of letters exchanged between him, the late Landgrave of Hesse, and Rothmann. Rantzov had long ago suggested the publication of this series of scientific essays, and copies of some of them had been sent to Hagecius and Peucer, who had expressed a similar wish. They were printed in Tycho's own office, and form a quarto volume of 310 pp., and 38 pp. of laudatory poems, dedication, and preface. The title shows that Tycho intended afterwards to publish letters to and from other astronomers, an intention which he did not live to carry out, so that only some of these letters have of late years been published. None of Tycho's