Hubbard, period of comet of 1843 [105] [351]
Huggins, Sir William, spectroscopic observations of prominences, [170] [195]
hydrogen spectrum in stars, [178] [198]
daylight coronal photography, [178] [179]
repulsive action in corona, [191]
stellar motions in line of sight, [201] [386] [387]
transit of Mercury, [245]
occultation of a star, [263]
snowcaps on Mars, [276]
spectrum of Mars, [277]
of Jupiter, [290]
Jovian markings and sun-spots, [297]
spectrum of Uranus, [304]
of comets, [342] [343]
photographs, [354] [357]
stellar spectroscopy, [373]
colours of stars, [374]
classification of star spectra, [376]
photographs, [382] [383] [438]
stellar chemistry, [381] [382]
spectra of new stars, [393] [395]
theory of Nova Aurigæ, [397]
spectra of nebulæ, [401] [402] [407]
nebular radial movement, [405]
Huggins, Sir William and Lady, photograph of Uranian spectrum, [305];
spectra of Wolf-Rayet stars, [380]
ultra-violet spectrum of Sirius, [383]
nitrogen in stars, [384]
spectrum of Nova Aurigæ, [396]-398
of Andromeda nebula, [403]
of Orion nebula, [407] [Pg 479]
Humboldt, sun-spot period, [126];
magnetic observations, [127]
meteoric shower, [329]
Hussey, T. J., search for Neptune,[ 79]
Hussey, W. J., cloud effects on Mars, [281];
cometary appendages, [369]
period of δ Equulei, [419]
discoveries of double stars, [419] [433]
Huygens, stellar parallax,[ 16];
Orion nebula,[ 22]
discovery of Titan,[ 84]
Saturn's ring,[ 85], [301]
spot on Mars, [275]
Hydrogen, a constituent of prominences, [168] [195] [199];
spectrum, [178] [198] [383] [384]
absorption in stars, [198] [373] [381]-383
in sun, [211]
theoretical material of comets' tails, [347]
emissions in stars, [377]-380 [384] [393] [397]
in nebulæ, [402] [407]
Innes, Southern double stars, [419]
Jacoby, measurement of Rutherfurd's plates, [410];
Pritchard's parallax work, [417]