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Plate 1. Photographs of the cornea in embryos stage 19-23

Photographs of the cornea in embryos belonging to horizons xix to xxiii.

A segment of the cornea near the mid-line is shown in an embryo of each horizon. The mesoclermal component is a thin layer one or two cells thick in the youngest stage. The stroma gmclually increases in thickness, and the cells at the inner border form a mesothelium. In the oldest specimen (Hg. 13), :1 part of the lens is included. The pupillary membrane is seen in the space between the mesothelium (Descement's) and the epithelium of the lens.

Fig. 14. No. 5609, xix, I5-I-I x 800.

Fig. 15. No. 431, xx, 37-2-2, x800.

Fig. 16. No. 1358F, xxi, 7-2-1, x800.

Fig. 17. No. 3681, xxii, 32-2-4, x800.

Fig. 18. No. 4570, xxiii, 70-3-4, x800.

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