Note 2 — EMBRYOLOGY.

Von Baer who is often stated to have established the above generalization really maintained a somewhat different view. He held (Ueber Entwickelungsgeschichte d. Thiere, p. 224) that the embryos of higher forms never resembled the adult stages of lower forms but merely the embryos of such forms. Von Baer was mistaken in thus absolutely limiting the generalization, but his statement is much more nearly true than a definite statement of the exact similarity of the embryos of higher forms to the adults of lower ones.