Christison, J. Sanderson (John Sanderson), 1856-1908 · Chicago · leaf 73
Fig. 2 —Brain of a one-monthhuman embryo. Fig. 3 —Brain of a two-monthhuman embryo. and they even exist quite distinctly in animals of amuch lower grade in the biologic scale, as theechidna and macropus (2), while they are absent inanimals which in other respects are more highlyorganized, as birds,…
Brain · Mind and body
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
