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PREFACE.
Memoirs of the Literary and Philosophical Society of Manchester, vol. vi., and in woodcut in Nature, vol. xv. Most of the other illustrations are taken from Tycho's own works. For photographs, from which the illustrations in Chapter XI. were made, I am indebted to Professor Safarik of Prague, who has also kindly communicated various particulars about Tycho's life in Bohemia.
J. L. E. DREYER.
The Observatory, Armagh,
September 1890.
September 1890.
