YOLK

n. Yo3lk. See VITELLUS. Acce ory y., Food y. See Nutritive VITELLUS. Formative y., Germinal y. See Formative VITELLUS. Nutritive y. See Nutritive VITELLUS. Principal y. See Formative VITELLUS. Subordinate y., Supplemental y. See Nutritive VITELLUS. White y. See Wtiite VITELLUS. Yellow y. See Yellow VITELLUS. Y. cleavage, Y. division. See Germ SEGMENTATION. Y. of egg. See VITELLUS (2d def.). Y. rest. In embryology, the residual internal ma of segmentation spheres. [A, 5.] Y.-spherules. See Viteliine GRANULES. Y.-stalk. That portion of the y.-sack that connects the latter with the embryo, [a, 34.] [s. 739]