CONTENTS. 



LeEBon. F&ge* 



1. Intellectual Pleasures, - - 1 



2. Mental Improvement, - - • - 3 



3. Habit of Attentive Thought, . - 5 



4. Cultivation of Memory, - - - - G 



5. Plan of Reading, - - - - 8 



6. Hymn to Science, - - - - 10 



7. Usefulness of Mathematical Studies, - 13 



8. Imagination, — its Power illustrated, - - 14 



9. Beauty and Sublimity, Illustration of, - 16 



10. Taste, Improvement and Pleasures of, - - IS 



11. Poetry,— its Object, .... 20 



12. Advantages of Studying History, - - 21 



13. Philosophy, — its leading Offices, - - 23 



14. The Praise of Philosophy, - - - 25 



15. General Properties of Bodies, - - - 27 



16. Attraction of Gravitation. Sir Isaac Newton's Dis- 



coveries, r - - - . - 30 



17. Centre of Gravitv. Pyramids of Egypt. Tower 



of Pisa, ' 33 



18. The Laws of Motion. Velocity, Momenta, Action 



and Re-action, - - _ - _ 35 



19. Compound Motion. The Pendulum, - - 37 



20. Mechanical Powers. The Lever, - - - 40^ 



21. The Pulley, Wheel, and Axle, and Inclined Plane, 42 



22. The Wedge and Screw. Friction, - - 44 



23. The Laws of Fluids. Pressure of Fluids, - - 47 



24. Specific Gravity of Bodies. Archimedes, - 50 



25. Hydraulics. Syphon. Common Pump. Forcing 



Pump, - , , - - - 52 



26. The Diving Bell, and Steam Engine, - - 54 



27. Nature and Properties of Air. The Air Pump, 56 



28. The Barometer, Uses of, - - - - 59 



29. Sound. Velocity of Sound. Echo, - - 61 



30. Nature of Musical Sounds. Musical Barometer, 64 



31. Optics. Reflection and Refraction of Light, - 66; 



M'^89^yl 



