One of the strongest arguments of the evolutionist is that certain changes take place in the pre-natal history of the human embryo, which answer to the supposed descent of man from the bit of protoplasm, via, fishes, reptiles, and mammals to man.
Robert Chambers in his well known book, " Vestiges of the Natural History of Creation," 1844, traces the brain of the human embryo as first similar in development to that of a fish's, then of a reptile's, then of a bird's, then of a mammal's, and finally it attains to the brain of a man. He traces the same with the human fetal heart. First, he says, it is like the heart of an insect, then divided into ventricle and auricle it becomes similar to that of a fish, then a sub-division of the auricle, making a triple-chambered form, it becomes like a reptile's, and lastly the ventricle being sub-divided, taking on a quadruple-chambered form it becomes a full mammal heart.
Granted that this is so, it only shows how all creation physically is related. But changes which take place out of sight during a short nine months do not prove that evolution, demanding according to the scientists millions of years, is a true theory. The out-of-sight evidence should surely have evidence within sight to answer to and confirm it. In other words, if the theory as to pre-natal changes is to be effective, it must be accompanied by postnatal corroboration, and this is QUITE LACKING. The fetus of a fish always produces a fish; of a reptile, a reptile; of a mammal, a mammal; of man, a man. After all, the vast difference in the finished product, say the difference between a worm and a man, between an insect and an elephant, between a spider and an eagle, shows that there must be an essential difference in the embryo, even in its first stage.