Witt, Herr, discovery of, 223 Working Catalogue, the, 142 Zenith sector, 82, 305 ---- tube, 75, 305 Zeta Ursæ Majoris, 306 Zubeneschamal, 184 THE END LONDON: PRINTED BY WILLIAM CLOWES AND SONS, LIMITED, STAMFORD STREET AND CHARING CROSS. * * * * * Transcriber's note: Minor typographical errors have been corrected without note. Irregularities and inconsistencies in the text have been retained as printed. The illustrations have been moved so that they do not break up paragraphs. Mismatched quotation marks were not corrected if it was not clear where the missing quotation mark should be placed.