The Age of Trees The Atmosphere Belladonna Berries The Big Eaters The Blossom The Boiling Pot The Book The Building of the City The Bumble-Bee Butterflies Catania The Cells The Chase Clouds Cotton The Cows Day and Night The Earth Earthquakes Effects of the Thunderbolt Electricity Emile's Observation The Epeira's Bridge The Experiment with Paper The Experiment with the Bottle of Cold Water The Experiment with the Cat The Fairy Tale and the True Story Flax and Hemp The Fleece Franklin and De Romas Fruit Gold and Iron Honey In the Woods A Journey to the End of the World The Kettle The Length of Animal Life The Locomotive Metal Plating The Metals The Metamorphosis Mother-of-Pearl and Pearls Mushrooms The Nettle The Numerous Family The Old Pear-Tree The Orange-Agaric Paper Poisonous Plants Pollen Printing Processionary Caterpillars The Queen-Bee Rain Running Water The Sea Shall We Kill Them Both? The Sheepfold Shells Silk The Six The Spider's Web Spiders The Spiral Snail The Storm The Story of Pliny The Subterranean Furnace The Sun The Swarm The Thermometer Thunder and the Lightning-Rod The Velocity of Sound Venom Venomous Insects The Viper and the Scorpion Volcanoes Waves—Salt—Seaweeds Wax The Wily Dervish The Year and Its Seasons