THE STUDENT'S MANUAL
g. Moisture of the air:
(1) Evaporation of water:
(2) Condensation of vapor:
3. ELEMENTARY ASTRONOMY:
(a) Under what conditions evapora-
tion goes on best: 636.
(b) Temperature and dryness of air:
evaporation 636; rain 1582.
(c) Piaces from which most of the
water is evaporated: Sahara Desert 1654; Dead Sea 570; Tibet 1909; Atacama Desert 129.
'(a) How condensation is brought about: rain 1582: fog 688; distillation 535; frost 720.
(b) What is meant by the dew-point:
526.
(c) Clouds, what they are and how
formed: 412.
(d) Fog and mist: 688.
(e) Rain: how it is formed 1582.
(f) Snow and hail: how they are
formed and how they differ 1773; 824.
(g) Dew and frost: what each is and
how each is formed; how they differ from each other; best conditions for formation; effect of wind and clouds on formation: dew 526; frost 720; rain 1582.
a. The nebular theory: 1316; 1030; 127.
(1) The original nebulous mass: 1316; 127.
(2) Condensation of part of the mass and the resulting increase
in rate of rotation: 1316.
(3) Throwing off of parts due to centrifugal force: 1316.
(4) Masses making what we call planets thrown off from the
sun: 1316.
b. The eight planets with their satellites: 1499; 1682; names, size and posi-
tion in relation to the sun and the earth 1500; sun 1848; moon 1259; Kepler 1000.
c. The earth — our planet:
f(a) Rotation: time of rotation, inclination of the axis 573. (b) Revolution: time of revolution, shape of path around the sun 573; gravitation 796; equinox 622; eclipse 579; Copernicus 451.
(1) The movements of the . earth:
d. The moon — the satellite of the earth: 1259.
(1) Size: 1259.
(2) Distance from the earth: 1259; 573.
(3) Character of its surface: 1209.
(4) Its lack of atmosphere and of life: 1259.
(5) Why its shape apparently changes: 1259; 579.
e. The fixed stars: 1813.
(1) The North Star: 1360,
f. Meteors and comets: 1212; 432; 129.
g. The Milky Way: 1226.
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