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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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