" For myself, I venture confidently to look back thousands on thousands of generations, and I see an animal striped like a zebra, but perhaps otherwise very differently constructed, the common parent of our domestic horse, whether or not it be descended from one or more wild stocks of the ass, hemionous, quagga, or zebra.p.

Thus, for instance, Mr. Darwin builds a most ingenious argument on the tendency of the young of the horse, ass, zebra, and quagga, to bear on their shoulders and on their legs certain barred stripes.