Habitability of Moon, 123.
” ” Other Worlds, 133.
Hall, Professor Asaph, 195.
Halley’s Comet, 263;
Reappearance of, 266.
Heat, Internal, of Earth, 115.
” of the Sun, 1.
Heating Effect of Electric Lamp, 6.
Height of Flagstaff, 110.
” ” India-rubber Ball, 19.
” ” Meteor, 296.
” ” the Sun, 57.
Herschel, Caroline, 233, 239.
” William, 230.
” ” at Windsor, 238.
Herschel’s Saturn, 239.
“Hœdi,” or Kids, 385.
Holmes, Oliver Wendell, 370.
Hot Water and the Sun, 14.
Houzeau, 322.
How Astronomers measure the Distances of the Heavenly Bodies, 19.
How Planets are weighed, 142.
” to find the Planets, 390.
” ” name the Stars, 381.
” ” split up a Ray of Light, 351.
Humming-top, 182.
Hundreds of Thousands of Libraries required, 376.
Hyperion, Distance and Period of, 392.