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Militaire del' Imperio Ottomano of Count Marsigli, (in Haya, 1732, in folio,) and a description of the Seraglio, approved by Mr. Greaves himself, a curious traveller, and inserted in the second volume of his works.] [Footnote 89: From the series of cxv. viziers, till the siege of Vienna, (Marsigli, p. 13,) their place may be valued at three years and a half purchase.] [Footnote 90: See the entertaining and judicious letters of Busbequius.] The only hope of salvation for the Greek empire, and the adjacent kingdoms, would have been some more powerful weapon, some discovery in the art of war, that would give them a decisive superiority over their Turkish foes. Such a weapon was in their hands; such a discovery had been made in the critical moment of their fate. The chemists of China or Europe had found, by casual or elaborate experiments, that a mixture of saltpetre, sulphur, and charcoal, produces, with a spark of fire, a tremendous explosion. It was soon observed, that if the expansive force were compressed in a strong tube, a ball of stone or iron might be expelled with irresistible and destructive velocity. The precise æra of the invention and application of gunpowder [91] is involved in doubtful traditions and equivocal language; yet we may clearly discern, that it was known before the middle of the fourteenth century; and that before the end of the same, the use of artillery in battles and sieges, by sea and land, was familiar to the states of Germany, Italy, Spain, France, and England. [92] The priority of nations is of small account; none could derive any exclusive benefit from their previous or superior knowledge; and in the common improvement, they stood on the same level of relative power and military science. Nor was it possible to circumscribe the