When they are intended to set fire to magazines, buildings, &c. the composition must be mealed powder 10, saltpetre 2, sulphur 4, and rosin 1; or rather mealed powder 48, saltpetre 32, sulphur 16, rosin 4, steel or iron filings 2, fir-tree saw-dust boiled in saltpetre ley 2, birch-wood charcoal 1, well rammed into a shell for that purpose, having various holes filled with small barrels, loaded with musket-balls; and lastly the whole immerged in melted pitch, rosin and turpentine oil. _Smoke_-BALLS are prepared as above, with this difference, that they contain 5 to 1 of pitch, rosin and saw-dust. This composition is put into shells made for that purpose, having 4 holes to let out the smoke. Smoke-balls are thrown out of mortars, and continue to smoke from 25 to 30 minutes. _Stink_-BALLS are prepared by a composition of mealed powder, rosin, saltpetre, pitch, sulphur, rasped horses and asses hoofs, burnt in the fire, assa-fœtida, seraphim gum or ferula, and bug or stinking herbs, made up into balls, as mentioned in _Light_-BALLS, agreeably to the size of the mortar out of which you intend to throw them. _Poisoned_ BALLS. We are not sure that they have ever been used in Europe; but the Indians and Africans have always been very ingenious at poisoning several sorts of warlike stores and instruments. Their composition is mealed powder 4, pitch 6, rosin 3, sulphur 5, assa-fœtida 8, extract of toad’s poison 12, other poisonous substances 12, made into balls as above directed. At the commencement of the French Revolution poisoned balls were exhibited to the people said to have been fired by the Austrians, particularly at the siege of Lisle. We have seen some of this sort. They contained glass, small pieces of iron, &c. and were said to be concocted together by means of a greasy composition which was impregnated with poisonous matter. In 1792, they were deposited in the Archives of Paris.