I would, moreover, draw attention to the remarkable, sculptured columns which support the main portal of the main pyramid-temple called El Castillo at Chichen-Itza. These represent gigantic feathered serpents and are figured on pl. XIV of Mr. Wm. Holmes’ most instructive and useful “Archaeological Studies,” Part I, “Monuments of Yucatan.” The feathers carved on the massive columns are evidently the precious tail feathers of the quetzal, which have the peculiarity of exhibiting, according to the way the light falls upon them, blue, red, yellow and green colors—precisely those assigned to the four quarters by the Mexicans and for all we know to the contrary, by the Mayas. Whether this feather was chosen for this peculiarity or for its beauty only, as that with which to deck the effigy of the divinity, can, of course, only be conjectured. In Mexico numberless effigies of feathered serpents exist. The resemblance of the sound of the Nahuatl words: feather=ihuitl, and heaven or sky=ilhui-çatl, should be recorded here as a possible reason for the association of feathers with the serpent and as a means of conveying the idea of its divinity. It should also be noted that quetzal, the name of the most precious feathers the natives possessed, resembles in sound, the second part of the Nahuatl words for flame=tle-cueçal-lotl, or for “tongue of fire”=tle-cueçal-nenepilli. That the feathered serpent was an image of the divinity is finally proven, I think, by the following passage from Sahagun which establishes that the earliest form, under which the divinity was revered by the Mexicans, was that of fire: “Of all the gods the [most] ancient one is the God of Fire, who dwells in the midst of flowers, in an abode surrounded by four walls and _is covered with shining feathers like wings_” (_op. cit._ book VI, chap. IV). It is thus shown that whilst the word ihuitl=feather suggested something divine, the word quetzal, besides being the name of a particular kind of feather, conveyed the idea of something resplendent or shining [like fire]. The name for serpent, coatl, signified twin; thus there is a profound analogy between the Maya and Mexican symbol, pointing, however, to the Yucatan form as the most ancient.