File:Corner1922 plate01.jpg

(2) Section illustrating structure of a normal 7-day pig ovum. This is the same specimen shown in text-figure 1a. X600; i.c.m., inner ceil mass.

(3) Section of abnormal ovum shown in figure 1 b, illustrating flattening of the vesicle with partial degeneration of its cells. X 600.

(4) ejection of a degenerating flattened embryonic vesicle of about the 7th or 8th day. X 600.

(5) Section through normal blastodermic vesicle of the 1 1th day. X 150.

(6) Section through tumor mass in wall of early blastodermic vesicle, showmg irregular growth of embryonic cells. X 150. Drawings made directly on stone.

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