Chapter 3: Heat, Light and Electricity
- Agency of heat, light, and water
- Solar heating
- Theories about the nature of heat
- Heat radiated by the sun
- Clouds and solar heat
- Fog and solar heating
- Heat loss by radiation
- Frost hollow pockets
- Frosts on still nights
- Coverings for frost protection
- Position of frost protection covers
- Heat produced by walls
- Heat from a covering of snow
- The cause of dew
- The nature of light
- The influence of solar rays on vegetation
- The three properties of light
- The influence light on vegetation,
- Electrical effects on vegetation
- The nature of electricity
- The application of electricity to promote the growth of plants
- Water is a compound of oxygen and hydrogen
- The necessity of water for vegetation
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