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use of burning-glasses was never adopted in the attack or defence of places. Yet the admirable experiments of a French philosopher have demonstrated the possibility of such a mirror; and, since it is possible, I am more disposed to attribute the art to the greatest mathematicians of antiquity, than to give the merit of the fiction to the idle fancy of a monk or a sophist. According to another story, Proclus applied sulphur to the destruction of the Gothic fleet; in a modern imagination, the name of sulphur is instantly connected with the suspicion of gunpowder, and that suspicion is propagated by the secret arts of his disciple Anthemius. A citizen of Tralles in Asia had five sons, who were all distinguished in their respective professions by merit and success. Olympius excelled in the knowledge and practice of the Roman jurisprudence. Dioscorus and Alexander became learned physicians; but the skill of the former was exercised for the benefit of his fellow-citizens, while his more ambitious brother acquired wealth and reputation at Rome. The fame of Metrodorus the grammarian, and of Anthemius the mathematician and architect, reached the ears of the emperor Justinian, who invited them to Constantinople; and while the one instructed the rising generation in the schools of eloquence, the other filled the capital and provinces with more lasting monuments of his art. In a trifling dispute relative to the walls or windows of their contiguous houses, he had been vanquished by the eloquence of his neighbor Zeno; but the orator was defeated in his turn by the master of mechanics, whose malicious, though harmless, stratagems are darkly represented by the ignorance of Agathias. In a lower room, Anthemius arranged several vessels or caldrons of water, each of them covered by the wide bottom of a leathern tube, which rose to a narrow top, and