. The development of the chick; an introduction to embryology . 7^ S-J ■ -. Fig. 161.— Equatorial section throufihthe lens of a chick embryo of eight(hiys. The main mass of the entirelens is represented by irreguhirlyarranged central fibers. Towardsthe surface (above) the fillers arearranged in rows and are quiteregularly six sided. (After Rabl.) 278 THE DEVELOPMENT OF THE CHICK that the epithehum is ori,:ening increases more a short distancefrom the equator, so that there is a broad ring-shaped thickeningof the anterior epithelium separated by a narrow thinner zonefrom the cells of the equato
. The development of the chick; an introduction to embryology . 7^ S-J ■ -. Fig. 161.— Equatorial section throufihthe lens of a chick embryo of eight(hiys. The main mass of the entirelens is represented by irreguhirlyarranged central fibers. Towardsthe surface (above) the fillers arearranged in rows and are quiteregularly six sided. (After Rabl.) 278 THE DEVELOPMENT OF THE CHICK that the epithehum is ori,:ening increases more a short distancefrom the equator, so that there is a broad ring-shaped thickeningof the anterior epithelium separated by a narrow thinner zonefrom the cells of the equatorial zone (cf. Fig. 159). This ringincreases in thickness during the greater part of the period ofincubation, and its cells become fibers arranged in a radial direc-tion. The meaning of this curious structure is somewhat obscui-e,but froiu the fact that it shows on its surface the impression ofthe ciliary processes, Rabl was of th
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