CONTEXTS. Tii 



COMMON THINGS. FIRE. 



PAGIi 



Fire an ancient element. 2. Combustion. 3. Fuel. 4. Carbon. 

 5. Hydrogen. 6. Charcoal fire, 7. Its effect on the air. 8. 

 Experimental illustration of combustion of charcoal. 9. Com- 

 bustion of hydrogen. 10. Hovr the combustion is continued. 

 11. Carbon burns -without flame. 12. What is flame ? 13. 

 Combustion of hydrogen produces water. 14. All combustibles 

 produce carbonic acid and water. 15. Carburetted hydrogen. 

 16. Carbon renders flame white. 17. Olefiant gas. 18. Light 

 carburetted hydrogen. 19. Fire-damp. 20. Will-o 1 -the- Wisp. 

 21. Experimental illustration. 22. Heavy earburetted hy- 

 drogen. 23. Pit-coal 24. Coal-fire explained. 25. Products 

 of its combustion. 26. Its effect on the air. 27. Wood-fuel. 

 28. Combustibles used for illumination. 29. Their effect on 

 the air. 30. Construction of grates and chimneys. 31 . Analysis 

 of a common coal-fire. 32. It warms and ventilates. 33. 

 Necessity for ventilation. 34. Injurious effect of plants at night. 

 35. Effect of crowded and brilliantly lighted rooms. 36. 

 Explanation of the burning of a candle. 37. And of lamps . 193 



