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CONTENTS. 



THE SKY. 



PAGE 



. 1 



. 1 



. 2 



. 2 



. 3 



. 3 



Sky, definition of . . 



Stars, what they are ... 

 Sun, probable planets of 



Nebulee 



Solar system 



Planets, list of 



Sun, the source of light . 



size, diameter, &c. . 



spots on 



compared with size of planets 

 Orbits, elliptical . 

 Ellipse, definition of ... 

 Earth's orbit, form of ... 



Mercury 



Venus 



Planets, inferior and superior 



conj unction and opposition of 

 The Earth 



form of, demonstrated . 9 

 diurnal motion of . .10 

 rate of motion of . .10 



PAGE 



Equinoxes and solstices . .12 



The Moon 12 



phases of . . . .13 



Mars 14 



Jupiter 16 



satellites of . . .18 

 Saturn 18 



rings of . . . .19 



Uranus , 21 



Neptune ... 22 



The planetoids . 22 



supposed origin of 23 



The stellar system . 24 



Stars, number of . 24 



The Milky Way . 24 



Nebulje 24 



Constellations 25 



Stars, double 26 



variable 27 



Comets .27 



THE AIR. 



Dew, artificial formation of . .34 

 Clouds and fogs . . . .35 



Lightning 36 



conductors . . .37 

 Thunder-storms . . . .38 



Rainbow 39 



Air, the source of nourishment . 40 

 carbonic acid of ... 41 

 the source of coal . . .41 



