Electric Eel. Its electric organs. Compared to the electric Leyden phial 202
Discovery of fire. Tools of steel. Forests subdued. Quantity of food increased by cookery 212
Medusa originally an hieroglyphic of divine wisdom 218
Cause of explosions from combined heat. Heat given out from air in respiration. Oxygene looses less heat when converted into nitrous acid than in any other of its combinations 226
Sparks from the collision of flints are electric. From the collision of flint and steel are from the combustion of the steel 229
Gunpowder described by Bacon. Its power. Should be lighted in the centre. A new kind of it. Levels the weak and strong 242
Steam-engine invented by Savery. Improved by Newcomen. Perfected by Watt and Boulton 254
Divine benevolence. The parts of nature not of equal excellence 278
Mr. Boulton's steam-engine for the purpose of coining would save many lives from the executioner 281
Labours of Hercules of great antiquity. Pillars of Hercules. Surface of the Mediteranean lower than the Atlantic. Abyla and Calpe. Flood of Deucalion 297