The column is again divided into the shaft, which is Yo; and the capital, which is In. The capital is itself twofold, consisting of a curved member and an angular member. These two appear in their utmost simplicity in the _echinus_ (In) and the _abacus_ (Yo) of a Greek Doric cap. The former was adorned with painted leaf forms, characteristically feminine, and the latter with the angular fret and meander (Illustration 12). The Ionic capital, belonging to a more feminine style, exhibits the abacus subordinated to that beautiful cushion-shaped member with its two spirally marked volutes. This, though a less rational and expressive form for its particular office than is the echinus of the Doric cap, is a far more perfect symbol of the feminine element in nature. There is an essential identity between the Ionic cap and the classic console before referred to--although superficially the two do not resemble each other--for a straight line and a double spiral are elements common to both (Illustration 10). The Corinthian capital consists of an ordered mass of delicately sculptured leaf and scroll forms sustaining an abacus which though relatively masculine is yet more curved and feminine than that of any other style. In the caulicole of a Corinthian cap In and Yo are again contrasted. In the unique and exquisite capital from the Tower of the Winds at Athens, the two are well suggested in the simple, erect, and pointed leaf forms of the upper part, contrasted with the complex, deliquescent, rounded ones from which they spring. The essential identity of principle subsisting between this cap and the Renaissance baluster by San Gallo is easily seen (Illustration 13). [Illustration 11] [Illustration 12] This law of sex-expressiveness is of such universality that it can be made the basis of an analysis of the architectural ornament of any style or period. It is more than mere opposition and contrast. The egg and tongue motif, which has persisted throughout so many centuries and survived so many styles, exhibits an alternation of forms resembling phallic emblems. Yo and In are well suggested in the channeled triglyphs and the sculptured metopes of a Doric frieze, in the straight and vertical mullions and the flowing tracery of Gothic windows, in the banded torus, the bead and reel, and other familiar ornamented mouldings (Illustrations 14, 15, 16). There are indications that at some time during the development of Gothic architecture in France, this sex-distinction became a recognized principle, moulding and modifying the design of a cathedral in much the same way that sex modifies bodily structure. The masonic guilds of the Middle Ages were custodians of the esoteric--which is the theosophic--side of the Christian faith, and every student of esotericism knows how fundamental and how far-reaching is this idea of sex.