TABLE OF CONTENTS 



CHAPTER PAGE 



I. THE EARTH AND ITS NEIGHBORS. 



1. The Evening Sky ; North Star ; Poles 1 



2. The Earth; Stars; Planets; Solar System; Nebular 



Hypothesis ........ 3 



3. Properties of Matter ; Extension ; Gravity ; Inertia ; 



Forces ........ 6 



4. Relation of the Earth to Sun and Moon ; Tides . . 11 



II. THE PLANET EARTH. 



5. The Shape of the Earth . . . . . . 16 



6. The Size of the Earth . . . . . ' . 18 



7. Effect on Life of the Irregularities of the Earth's 



Exterior . ... . . ; . .18 



8. The Interior of the Earth . % - . . . .' . .21 



9. The Cause of Day and Night ; Rotation of the Earth 2 1 



10. The Movement of the Earth around the Sun ; The Year 23 



11. Latitude Zones . .25 



12. The Cause of the Seasons .... .,-. . 26 



13. The Measurement of Time; Solar, Sidereal, and 



Lunar Days ....... 28 



14. Standard Time ; Time Belts: Eastern, Central, Moun- 



tain, Pacific 30 



15. Meridians and Parallels of Latitude; Degrees; Min- 



utes ; Seconds ....... 32 



16. Determination of Longitude 33 



17. Magnetism of the Earth; Compass; Magnetic Pole; 



Declination ...... .34 



18. Magnetism; Electromagnets; Permanent Magnets . 36 



19. The Magnetic Field of Force ; Dipping Needle . . 39 



20. The Mariner's Compass ...... 40 



21. Theory of Magnetism ; Molecule?; Like Poles . . 41 



III. THE GIFTS OF THE SUN TO THE EARTH. 



22. Energy, Potential and Kinetic ; Work ; Transforma- 



tion and Conservation of Energy ... 45 



23. Heat and Light ; Gifts of the Sun .... 47 



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