Among the ruins of Chichen are none more remarkable than that called by the natives "Egclesia" or the Church. It is described by Mr. Stephens as consisting of "two immense parallel walls each two hundred and seventy-five feet long, thirty feet thick, and placed one hundred and twenty feet apart. One hundred feet from the northern extremity, facing the space between the walls, stands, on a terrace, a building thirty-five feet long, containing a single chamber, with the front fallen, and rising among the rubbish the remains of two columns elaborately ornamented, the whole interior wall being exposed to view, covered from top to bottom with sculptured figures in bas-relief much worn and faded. At the southern end also, placed back a hundred feet and corresponding in position, is another building eighty-one feet long, in ruins, but also exhibiting the remains of this column richly sculptured. In the centre of the great stone walls, exactly opposite each other, and at the height of thirty feet from the ground, are two massive stone rings, four feet in diameter and one foot one inch thick, the diameter of the hole is one foot seven inches. On the rim and border are sculptured two entwined serpents; one of them is feather-headed, the other is not." May we regard them as allusive to the Serpent God and the Serpent Goddess of the Aztec mythology? Mr. Stephens is disposed to regard the singular structure here described as a Gymnasium or Tennis Court, and supports his opinion by a quotation from Herrara. It seems to others much more probable that, with the other buildings of the group, this had an exclusively sacred origin. However that may be, the entwined serpents are clearly symbolical, inasmuch as we find them elsewhere, in a much more conspicuous position, and occupying the first place among the emblematic figures sculptured on the aboriginal temples.