he student has developed an
appetite for the appreciation of order and sources of energy in
phenomena, he has passed his novitiate, and becomes one of that happy
body of men who not only see what is perceived by the mass of their
fellows, but are enabled to look through those chains of action which,
when comprehended, serve to rationalize and ennoble all that the
senses of man, aided by the instruments which he has devised, tell us
concerning the visible world.

INDEX.

AEtna, Mount, 381.

Agriculture,
American, 346;
in England, winning swamp lands for, 335;
recent developments of, 345.

Alaska, changes on the coast of, 96.

Ants taking food underground, 319;
work of the, on the soil, 318.

Apsides, revolution of the, 61, 62.

Arabians, chemical experiments of the, 13.

Arches, natural, in cavern districts, 258.

Artesian wells, 258, 259.

Arts, advance of Italian fine, 19.

Asteroids, 53;
motions of, about their centres and about the sun, 53.

Astronomers, the solar system and the early, 79.

Astronomy, 31-80;
growth of, since the time of Galileo, 33, 34;
the first science, 10.

Atmosphere, 97-206;
along the tropical belt, 102;
as a medium of communication between different regions, 99;
deprived of water, containing little heat, 105;
beginning of the science of the, 117;
counter-trade movements of the, 105;
envelope of the earth, 98;
expansion of, in a hollow wall during the passage of a storm, 114;
heat-carrying power of the, 105;
heights to which it extends, 99;
in water, 99;
movements no direct influence on the surface of the earth, 122;
movements of the, qualified by the condition which
it encounters, 118;
of mountains, 98;
of the seashore, 98;
of the earth, 98;
of the sun, 73;
snow as an evidence of, 65;
supplying needs of underground creatures, 331;
uprushes of, 101, 102;
upward strain of the, next the earth, 107;
weight and motion of the, 120, 121.

Atmospheric circulation of the soil, 330, 331;
envelopes, 97.

Aurora borealis, 168.

Avalanches, 210-213;
dreaded, in the Alpine regions, 212;
great, in the Swiss Oberland, 211, 212;
rocky, 175-177.

Axis,
imaginar