250 
INDEX. 
Plants, light and heat imprisoned 
in, 173- 
remains in coal-nodules, 180. 
Poker, sound of a vibrating, 
133- 
Pollen-dust carried by bees, 222. 
of flowers, 234, 236. 
Pollen, gathering of, 208. 
use of, 1 68. 
Pollinia of an orchis, 238. 
Polyps, coral, 21. 
Poole's Cavern, 120. 
Popgun, compressing air in, 61. 
Potash formed, 17. 
Potassium in water, 16. 
Pot-holes, 115. 
Pressure, making coal hard, 190. 
Primrose, corolla falling off, 170. 
Protoplasm, 159. 
green granules of, 161. 
Primrose, the life of a, 154. 
two forms of, 167. 
Princess-bees, slaughter of, 215. 
Prism giving coloured light, 39. 
Propolis, or bee-cement, 204. 
QUEEN-BEE, flight of, 209. 
laying eggs, 210. 
RAIN, causes of, 82, 83. 
fairies working in, 8. 
fall of barometer before, 70. 
Ravine worn by water, 114. 
Reflection of light, 43. 
Resonance in a jar, 150. 
Rhine, amount of lime carried by, 
112. 
Roches moutonnees, 126. 
Rock hurled by waves, 122. 
ST. JOHN'S WOOD, explosion in, 
138. 
Salvia, bee entering the, 232. 
Sap of plants, 161. 
Scent of flowers attracts insects, 
225. 
Science, fairy-tales of, 2. 
how to study, 18. 
Sculptors, water and ice, 103, 123. 
Sea-breeze and land-breeze, 73. 
Sea, why salt, 99 
what becomes of solid matter 
in, 100. 
Seeds, how formed, 169. 
oils in, 192. 
Selaginella, figure of, 182. 
Shale, piece of, with plants, 178. 
Shelley, cited, 148. 
Shell, music of the, 150. 
Sigillaria, 179, 183. 
Snow, cause of whiteness of, 94. 
fairies working in, 9 
Snow-crystals, 94. 
Snow-drop fairies, 10. 
Snowfields, 97. 
Snow-flakes, crystallization of, 93. 
Solid, definition of a, 15. 
Sound, globes of, 137. 
its nature, 132. 
reflection of, 138. 
Sounds of town and country, 130, 
132. 
Sound-waves, 135. 
South Ouram, coal-nodules at, 
180. 
Spectrum, coloured, 40. 
Sphinx hawk-moth visiting honey- 
suckle, 225. 
Spores of club-moss, 182. 
