Of all the ancient books not one was more prized by him than the Yi-king, or " The Book of Changes," the rudiments of which are assigned to Fuh-hi about the 30th century B.C. Those rudiments, however, are merely the 8 trigrams and 64 hexagrams, composed of a whole and a broken line (, - -), without any text or explanation of them earlier than the rise of the Chow dynasty.
He said that if his life were lengthened he would give fifty years to the study of the Yi, and might then be without great faults.
In 1844 Minas published a work, avowedly from a MS. with the superscription Galenus, entitled FaXrlvo13 Eiaa'yw yi, &aX€Krucii.
7) be two points of the surface; 0 1, 02 the inclination of the surface to the horizon at P 1 and P2; yi, y2 the heights of P 1 and P2 above the level of the liquid at a distance from all solid bodies.
Tension itself Cleanthes defined as a fiery stroke (ii yi irvpos); in his hymn to Zeus lightning is the symbol of divine activity.