Berlin, 1876.) attacking Pan.

and substituting a molecular hypothesis.

If I understand his views rightly, he would say that with a bird which strengthened its wings by use, the formative protoplasm of the strengthened parts became changed, and its molecular vibrations consequently changed, and that these vibrations are transmitted throughout the whole frame of the bird, and affect the sexual elements in such a manner that the wings of the offspring are developed in a like strengthened manner.

I imagine he would say, in cases like those of Lord Morton's mare (275/3.

A nearly pure-bred Arabian chestnut mare bore a hybrid to a quagga, and subsequently produced two striped colts by a black Arabian horse: see "Animals and Plants," I., page 403.