R.S.B. The Observatory, Cambridge. October, 1895

PTOLEMY'S THEORY OF THE MOVEMENT OF MARS.

EXPLANATION OF PLANETARY MOVEMENTS.

TYCHO'S "NEW STAR" SEXTANT OF 1572.

TYCHO'S "NEW SCHEME OF THE TERRESTRIAL SYSTEM," 1577.

GROUND-PLAN OF THE OBSERVATORY.

THE OBSERVATORY OF URANIBORG, ISLAND OF HVEN.

EFFIGY ON TYCHO'S TOMB AT PRAGUE. By Permission of Messrs. A. & C. Black.