It cannot be denied that such abrupt and great changes of structure are widely different from those which most species apparently have undergone.

He will further be compelled to believe that many structures beautifully adapted to all the other parts of the same creature and to the surrounding conditions, have been suddenly produced; and of such complex and wonderful co-adaptations, he will not be able to assign a shadow of an explanation.

He will be forced to admit that these great and sudden transformations have left no trace of their action on the embryo.
To admit all this is, as it seems to me, to enter into the realms of miracle, and to leave those of science..