Thomas Hunt Morgan Quote

Within the period of human history we do not know of a single instance of the transformation of one species into another one. It may be claimed that the theory of descent is lacking, therefore, in the most essential feature that it needs to place the theory on a scientific basis, this must be admitted.


Evolution and adaptation (ed. 1903)


Within the period of human history we do not know of a single instance of the transformation of one species into another one. It may be claimed that...

Within the period of human history we do not know of a single instance of the transformation of one species into another one. It may be claimed that...

Within the period of human history we do not know of a single instance of the transformation of one species into another one. It may be claimed that...

Within the period of human history we do not know of a single instance of the transformation of one species into another one. It may be claimed that...