The second step in fire-making was taken when it was discovered that a spark can be made by striking together a stone and a piece of iron ore. Strike a piece of flint against a piece of iron ore known as pyrites, or fire-stone, and you will make sparks fly. (Fig. 5.) Let these sparks fall into small pieces of dried moss or powdered charcoal, and the _tinder_, as the moss or the charcoal is called, will catch fire. It will glow, but it will not blaze. Now hold a dry splinter in the glowing tinder, and fan or blow with the breath and the splinter will burst into a flame. If you will tip your splinter with sulphur before you place it in the burning tinder, you will get a flame at once. This was the strike-a-light, or _percussion_, method of making a fire. It followed the friction method, and was a great improvement upon it because it took less work and a shorter time to get a blaze. The regular outfit for fire-making with the strike-a-light consisted of a tinder-box, a piece of steel, a piece of flint, and some splinters tipped with sulphur (Fig. 6). The flint and steel were struck together, and the sparks thus made fell into the tinder and made it glow. A splinter was applied as quickly as possible to the tinder, and when a flame was produced the candle which rested in the socket on the tinder-box was lighted. As soon as the splinter was lighted the cover was replaced on the tinder-box, so as to smother the glowing tinder and save it for another time. The strike-a-light method was discovered many thousands of years ago, and it has been used by nearly all the civilized nations of the world.[4] And it has not been so very long since this method was laid aside. There are many people now living who remember when the flint and steel and tinder-box were in use in almost every household. About three hundred years ago a third method of producing fire was discovered. If you should drop a small quantity of sulphuric acid into a mixture of chlorate of potash and sugar, you would produce a bright flame. Here was a hint for a new way of making a fire; and a thoughtful man in Vienna, in the seventeenth century, profited by the hint. He took one of the sulphur-tipped splinters which he was accustomed to use with his tinder-box, and dipped it into sulphuric acid, and then applied it to a mixture of chlorate of potash and sugar. The splinter caught fire and burned with a blaze. Here was neither friction nor percussion. The chemical substances were simply brought together, and they caught fire of themselves; that is to say, they caught fire by _chemical_ action.