V. The edifices of Justinian were cemented with the blood and treasure of his people; but those stately structures appeared to announce the prosperity of the empire, and actually displayed the skill of their architects. Both the theory and practice of the arts which depend on mathematical science and mechanical power, were cultivated under the patronage of the emperors; the fame of Archimedes was rivalled by Proclus and Anthemius; and if their miracles had been related by intelligent spectators, they might now enlarge the speculations, instead of exciting the distrust, of philosophers. A tradition has prevailed, that the Roman fleet was reduced to ashes in the port of Syracuse, by the burning-glasses of Archimedes; 95 and it is asserted, that a similar expedient was employed by Proclus to destroy the Gothic vessels in the harbor of Constantinople, and to protect his benefactor Anastasius against the bold enterprise of Vitalian. 96 A machine was fixed on the walls of the city, consisting of a hexagon mirror of polished brass, with many smaller and movable polygons to receive and reflect the rays of the meridian sun; and a consuming flame was darted, to the distance, perhaps of two hundred feet. 97 The truth of these two extraordinary facts is invalidated by the silence of the most authentic historians; and the use of burning-glasses was never adopted in the attack or defence of places. 98 Yet the admirable experiments of a French philosopher 99 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; 100 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. 101 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.