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GUNPOWDER, which is as you know a mixture of saltpetre,
sulphur, and charcoal separately pulverized, then granulated and dried,
and guns, were first invented by Swartz, a monk of Cologne, in 1340;
Edward the Third had four pieces of cannon, which contributed to gain
him the battle of Cressy, 1346; bombs and mortars were invented in the
same year.
[Illustration: ROUND THE FAMILY LAMP]