Whatever else the ancient world may owe to the learning of the Egyptians, it seems certain that they were the first to make use of stone as a constructive building material. As before mentioned, the Egyptians used a stone Proto-Doric pillar at least 1000 years before the Greeks or the Etruscans, or any other ancient people we know of, dreamt of such a thing. The Babylonians and Assyrians never seem to have used stone constructively, except as the revêtement of a terrace wall; and it was not till after the conquest of Egypt by Cambyses that we find any Asiatic nations using a pillar of stone in architecture, or doing more than building a wall, or heaping mass on mass of this material without any constructive contrivance. The Indians first learned this art from the Bactrian Greeks, and many civilised Asiatic nations still prefer wood for their palaces and temples, as the Assyrians did, and only use stone as “a heap.” It must have been difficult, however, for any intelligent people to visit the wonderful stone temples of Thebes and Memphis without being struck by their superior magnificence and durability; and we consequently find the Persians on their return, though reproducing their old forms, adopting the new material, which, fortunately for them and for our history, was found in abundance in the neighbourhood of their capitals. Even, however, on the most cursory inspection, it is easy to see how little the arts of the Assyrians were changed by their successors. The winged lions and bulls that adorn the portals at Persepolis are practically identical with those of Nineveh. The representations of the king on his throne with his attendants are so similar, that but for the locality it would require considerable knowledge to discriminate between Sennacherib and Xerxes. The long procession of tribute bearers—the symbolical animals slain by the king; the whole ornamentation, in fact, is so slightly altered from what existed in Assyria, that we are startled to find how little change in these sculptures the new dynasty had introduced; and if this is the case with them, and their position and arrangement are nearly identical, we may feel very certain that the architecture was also the same.