. The elements of Embryology. Embryology. 139. A. Diagrammatic section taken perpendicular to the plane of the paper, along the line y, y, Fig. 49. The stalk is not seen, the section falling quite out of its region, vh, hollow of optic cup filled with vitreous humour ; other letters as in Fig. 47 B. B. Section taken parallel to the plane of paper through Fig. 49, so far behind the front surface of the eye as to shave oflf a small portion of the posterior surface of the lens I, but so far in front as not to be carried at all through the stalk. Letters as before ; /, the choroidal fissure. C. Se
. The elements of Embryology. Embryology. 139. A. Diagrammatic section taken perpendicular to the plane of the paper, along the line y, y, Fig. 49. The stalk is not seen, the section falling quite out of its region, vh, hollow of optic cup filled with vitreous humour ; other letters as in Fig. 47 B. B. Section taken parallel to the plane of paper through Fig. 49, so far behind the front surface of the eye as to shave oflf a small portion of the posterior surface of the lens I, but so far in front as not to be carried at all through the stalk. Letters as before ; /, the choroidal fissure. C. Section along the line z, z, perpendicular to the plane of the paper, to shew the choroidal fissure /, and the continuity of the cavity of the optic stalk with that of the primary optic vesicle. Had this section been taken a little to either side of the line z, z, the wall of the optic cup would have extended up to the lens below as well as above. Letters as above. sen ted (the superficial epiblast of the head would also be shewn); but there would be nothing seen of either the stalk or the fissure. If on the other hand the section were taken in a plane parallel to the plane of the paper, at some distance above the level of the stalk, some such figure would be gained as that shewn in Fig. 50 B. Here the fissure / is obvious, and the communication of the cavity vh of the secondary vesicle with the outside of the eye evident; the section of course would not go through the superficial Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Foster, M. (Michael), Sir, 1836-1907. London, MacMillan
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