Chapter I: Iapetus, Distance and Period of, 392

Identification of Comets, 258.

India-rubber Ball, Height of, 19.

Inner Planets, The, 134.

Insects, Leaf-like, 204.

Institution, Royal, 53.

Internal Heat of Earth, 115.

Inventory of Worlds, 379.

Iris of the Eye, 202.

Iron Vapor, 291.

Island, Caroline, 42.

J.

Janssen’s Picture of Sun-spot, 36.

Jupiter, 214.

” compared with Earth, 214.

Jupiter’s Belts, 215.

” Clouds, 216.

” Diameter, 391.

” Distance, 391.

” Internal Heat, 218.

Jupiter’s Period of Revolution, 212, 391.

Jupiter’s Rotation, 215, 391.

” Satellites, 218.

” ” Eclipses of, 220.

Jupiter’s Satellites, Distances and Periods of, 392.

Jupiter’s Weight, 214.

K.

Kaiser Sea, 192.

Kepler, 174;
His Laws, 177, 186.

Kilauea, Volcano, 112.

Kirkwood’s Description of Meteor Shower, 1833, 301.

Krakatoa Eruption, 113.