N Napoleon, [67], [127]. Nasmyth, J., [73], [103]. Nebulæ, [30], [31], [207]-213, [228]. Nebular Hypothesis, [33], [195], [227], [228], [229], [230], [233]. Neison (Nevill), E., [73]. Neisten, [86], [105]. Neptune, [120], [121], [135], [229], [230]. Newall, H. F., [205]. Newcomb, S., [27], [64], [78], [89], [94], [162], [168], [220], [222], [223], [224], [232]. Newton, H. A., [140], [141]. Newton, Sir I., [2], [17], [29], [77]. Nichol, J. P., [31], [207]. Nordvig, L., [192].

O Olbers, H. W. M., [19], [20], [69], [98], [99], [123], [124], [125], [126], [127], [129], [130], [139], [148], [152], [153]. Olbers’ comet, [125]. Olmsted, D., [138], [207]. Ophiuchi (α), [183]. Orion, [221]. Orion nebula, [10], [33], [207], [208], [209], [213]. Orion stars, [174], [193], [209], [232]. Orionis (κ), [209]. Orionis (η), [209]. Orionis (θ), [209]. Orionis (U), [181], [182], [186], [187].

P Palisa, J., [100]. Pallas, [19], [99], [101]. Parallax, solar, [61], [62], [63], [101]. Parallax, stellar, [150]-158, [190]. Paris Congresses, [161]. Paris Observatory, [78], [118], [171]. Perrine, C. D., [81], [108], [194]. Perrine’s comet, [136]. Perrotin, H., [86], [91], [100], [114]. Peck, W., [162]. Persei (Nova), [192], [193], [194], [195]. Perseid meteors, [122], [141]. Perseus, [192], [221]. Peters, C. H. F., [100]. Peters, C. A. F., [142], [153], [155], [202]. Photography, astronomical, [54], [56], [57], [59], [75], [81], [94], [108], [113], [136], [158], [160], [161], [172], [175], [192], [193], [194], [203], [208], [209], [210], [211], [212]. Photometry, [176], [177]. Piazzi, G., [19], [20], [98], [150]. Pickering, E. C., [174], [175], [176], [177], [181], [182], [183], [185], [193], [194], [203], [204], [220], [221]. Pickering, W. H., [75], [76], [81], [91], [92], [93], [107], [113], [209]. Plana, G., [78], [79]. Pleiades, [124], [210], [217]. Pogson, N. R., [142], [180]. Pole Star, [205]. Pollux, [165], [170]. Pons, J. L., [127]. Pontécoulant, [79]. Potsdam Observatory, [46], [173], [176]. Pritchard, C., [158], [177]. Proctor, R. A., [4], [20], [38], [41], [90], [91], [104], [148], [163], [164], [218], [219], [220], [231]. Procyon (α Canis Minoris), [151], [203]. Prominences, solar, [52], [53], [55], [64]. Puiseux, P., [75]. Pulkowa Observatory, [200].

Q Quetelet, A., [139].

R Radiant points, meteoric, [139], [144], [145], [146]. Ranyard, A. C., [106], [146]. Red spot on Jupiter, [105], [106]. Regulus (α Leonis), [164], [165]. Relative parallax, [157]. Réseau, Photospherique, [59]. Resisting medium, [128]. Respighi, L., [55]. Reversing layer, [56], [57]. Ricco, A., [87], [105]. Rigel (β Orionis), [165], [209]. Ritchey, G., [194]. Roberts, A. W., [181]. Roberts, I., [209], [210]. Roche, E., [109]. Roman College Observatory, [85]. Rosse, third Earl of, [141], [156], [207], [208], [218]. Rosse, fourth Earl of, [77]. Rotation of the Sun, [58], [59]; of the planets, [82], [83], [84], [85], [86], [87], [104], [111], [112]. Rowland, H. A., [52]. Rutherfurd, L. M., [75], [169].

S Sabine, Sir E., [44]. Safford, T. H., [202]. Santini, G., [159]. Savary, F., [30], [199]. Satellites, [96], [107], [108], [112], [113], [115], [120], [121], [236]. Saturn, [20], [21], [22], [97], [103], [108]-113, [121], [135]. Schaeberle, J. M., [93], [107], [191], [203]. Scheiner, C., [44]. Scheiner, J., [166], [174], [176]. Schiaparelli, G. V., [82], [83], [84], [85], [86], [87], [91], [92], [114], [141], [143], [149], [201], [220], [224], [231], [235]. Schjellerup, H., [180]. Schmidt, J. F. J., [69], [70], [71], [72], [73], [104], [179], [180], [189]. Schönfeld, E., [160], [179], [180], [188], [189]. Schröter, J. H., [16], [65], [66], [67], [68], [69], [70], [74], [81], [82], [84], [85], [86], [87], [97], [99], [153]. Schwabe, S. H., [18], [43], [44], [46], [55]. Schwassman, A., [100]. Secchi, A., [52], [54], [55], [60], [72], [90], [114], [141], [170], [171], [173]. Secchi’s types of stellar spectra, [170], [171], [173], [174], [175], [189], [232]. See, T. J. J., [201], [202], [236]. Seeliger, H., [110], [195], [196], [202], [206], [224], [225]. Serviss, G. P., [158]. Sirius (α Canis Majoris), [151], [170], [173], [188], [202], [225]. Slipher, V. M., [106], [114], [204]. Sime, J., [27]. Sola, J. C., [112]. Solar cluster, [221], [222]. Solar system, motion of, [26], [27], [167], [168]. South, Sir J., [198]. Spectroscopic binaries, [203], [204], [205]. Spencer, H., [218]. Spica (α Virginis), [204]. Spörer, F. W. G., [45], [46], [54], [59]. Star-catalogues, [159], [160], [161], [162]. Star-clusters, [30], [31], [32], [206], [210]. Star-drift, [164]. Star-gauging, [36], [40], [41], [224]. Stars, distance of, [150]-158. Stars, distribution of, [35], [39], [40], [198]-214. Stars, double, [28], [29], [30], [197]-206. Stars, gaseous, [171], [174]. Stars, proper motion of, [162], [163], [164], [165]. Stars, radial motion of, [165], [166]. Stars, temporary, [156], [182], [188]-196. Stars, triple and multiple, [206]. Stars, variable, [177]-188. Stellar spectra, [169]-176, [187], [189], [190], [191], [193], [194]. Stellar universe, [35]-42, [214], [215]-226. Stereo-comparator, [100], [101]. Stokes, Sir G., [50]. Stone, E. J., [157], [160]. Stroobant, P., [88]. Struve, F. G. W., [3], [37], [38], [40], [42], [128], [151], [153], [200], [214], [215], [216], [218]. Struve, H., [201]. Struve, L., [27], [163], [167]. Struve, O. W., [27], [110], [115], [120], [153], [156], [163], [200], [201]. Stumpe, O., [167]. Sun, [15], [16], [17], [40], [43]-64, [65], [80], [81], [105], [125], [128], [170], [222], [228], [229], [230], [237]. Swift, L., [81]. Swift’s comet, [136].

T Tacchini, P., [55], [86], [87]. Taurus, [217], [221]. Tempel, E., [210]. Tennyson, [96]. Tidal friction, [79], [87], [233], [234], [235], [236]. Tisserand, F. F., [146]. Todd, D. P., [122]. Trans-Neptunian planet, [121], [122]. Trouvelot, E., [86], [87]. Tschermak, [148]. Tulse Hill Observatory, [171]. Turner, H. H., [194], [224]. Twining, A. C., [139].

U Upsala Observatory, [59]. Uranometria Argentina, [160]. Uranus, [11], [20], [22], [23], [97], [113], [114], [115], [118], [121], [135], [141], [230]. Ursa Major, [162], [164]. Ursæ Majoris (δ), [182]. Ursæ Majoris (ξ), [199].

V Venus, [18], [84]-88, [97], [235], [236]. Venus, transits of, [61], [62], [87]. Vega (α Lyræ), [151], [165], [170], [172], [173]. Very, F. W., [77]. Vesta, [19], [99], [101], [102]. Vogel, H. C., [84], [88], [95], [102], [106], [114], [131], [148], [166], [173], [174], [175], [183], [184], [185], [190], [191], [193], [195], [204], [209], [232], [233], [237]. Vulcan, [81].

W Washington Observatory, [96], [223]. Watson, J. C., [81], [100]. Webb, T. W., [72], [73], [104]. Weinek, L., [75]. Weiss, E., [142]. Well’s comet, [134]. Whewell, W., [218]. Williams, A. S., [110], [193]. Wilson, A., [16]. Winlock, J., [177]. Winnecke, F. A. T., [131]. Witt, K. G., [101]. Wolf, Max, [100], [181], [191], [194], [211]. Wolf, R., [44], [45], [188]. Wolf and Rayet, [171]. Wolf-Rayet stars, [171], [174]. Wollaston, W. H., [48]. Wright, T., [34], [110].