As we came down the steps we disturbed a huge iguana, which darted up the face of the ruin and ran along its edge, stopping motionless at the corner to peer over at us, its grey dewlapped head and hideous blinking eyes making it look like some animated gargoyle. Once more on the ground, we turned towards the eastern annexe of the nunnery, containing five open and two closed rooms. Its façade has scarcely a parallel in Central America. The twining-serpent frieze, the "elephant trunk," the diamond pattern, and other designs common in Mayan ornamentation are lavishly used, as can be seen from the illustration, while in a central arched niche is a bust with a headdress of feathers. Over the door are twenty curious cartouches, five in a row, and over these are six ornaments like capital T's stuck into the building by their stems. As we approach, two or three asses, startled from their grazing at the doorways, clatter off into the stony woodland. Lizard and wild ass! Could better illustration than these desolate, gaping palace chambers be found for Omar Khayyam's lines: "They say the Lion and the Lizard keep The Courts where Jamshyd gloried and drank deep; And Bahram--that great hunter--the wild ass Stamps o'er his head, but cannot break his sleep"? We sat awhile amid the fallen blocks of masonry in what must have been the nunnery courtyard, watching the swallows as they flew in and out of those timeworn doorways. Here and there amid the stunted wiry grass rose clumps of cactus and coarse thistle-like plants, while over all climbed a large blue convolvulus, its centre striped purple-red, making Nature's perfect harmony of colouring with a dainty butter-yellow foxglove-shaped flower which filled the air with a subtle musky perfume. Huge butterflies of orange and sulphur, of striped black and scarlet, of black and white, flitted among the blooms; while over us blazed the sun in a sea of blue, the rich blue of the eternal Carib summer. A few yards south-eastward of us stood Akad-zib, "House of the Mysterious Writing," eighteen-roomed and unique as being the only building in Chichen not on a mound. Its façade--a contrast to the palace--is severely plain, but the building has importance. In the room looking south, over the dark lintel of a doorway leading to an inner chamber, are two rows of hieroglyphics,--the best preserved in Chichen,--while on the ceiling of this doorway, carved in relief and seated in front of what appears to be a basin of incense, is a figure in full-feathered dress, a right angle of glyphs running round to its left. Southward beyond the Akad-zib we could just see that greener patch of woodland which marks where lies the huge cenote whence the Itzas drew their water supply. Approached by a winding path which runs to the water's level, the broken sides of the chasm admit the sunlight, and the blueness of the water and the golden green of the palm-leaves make a true tropic picture.