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 Accumulation of electricity not from friction 335 Mr. Bennet's sensible electrometer 345 Halo of saints is pictorial language 358 We have a sense adapted to perceive heat but not electricity 365 Paralytic limbs move by electric influence 367 Death of Professor Richman by electricity 373 Lightning drawn from the clouds. How to be safe in thunder storms 383 Animal heat from air in respiration. Perpetual necessity of respiration. Spirit of animation perpetually renewed 401 Cupid rises from the egg of night. Mrs. Cosway's painting of this subject 413 Western-winds. Their origin. Warmer than south-winds. Produce a thaw 430 Water expands in freezing. Destroys succulent plants, not resinous ones. Trees in valleys more liable to injury. Fig-trees bent to the ground in winter 439 Buds and bulbs are the winter cradle of the plant. Defended from frost and from insects. Tulip produces one flower-bulb and several leaf-bulbs, and perishes. 460 Matter of heat is different from light. Vegetables blanched by exclusion of light. Turn the upper surface of their leaves to the light. Water decomposed as it escapes from their pores. Hence vegetables purify air in the day time only. 462 Electricity forwards the growth of plants. Silk-worms electrised spin sooner. Water decomposed in vegetables, and by electricity 463 Sympathetic inks which appear by heat, and disappear in the cold. Made from cobalt 487 Star in Cassiope's chair 515 Ice-islands 100 fathoms deep. Sea-ice more difficult of solution. Ice evaporates producing great cold. Ice-islands increase. Should be navigated into southern climates. Some ice-islands have floated southwards 60 miles long. Steam attending them in warm climates 529 Monsoon cools the sands of Abyssinia 547 Ascending vapours are electrised plus, as appears from an experiment of Mr. Bennet. Electricity supports vapour in clouds. Thunder showers from combination of inflammable and vital airs 553 CANTO II. Solar volcanos analogous to terrestrial and lunar ones. Spots of the sun are excavations 14 Spherical form of the earth. Ocean from condensed vapour. Character of Mr. Whitehurst 17