It may be doubted whether any character can be named which is distinctive of a race and is constant.
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The expression often used by Mr. Herbert Spencer of the Survival of the Fittest is more accurate, and is sometimes equally convenient.
In the eyes of most naturalists, the structure of the embryo is even more important for classification than that of the adult. For the embryo is the animal in its less modified state; and in so far it reveals the structure of its progenitor.
Species of the same genus would occasionally exhibit reversions to lost ancestral characters.
Embryology will reveal to us the structure, in some degree obscured, of the prototypes of each great class.
Whoever is led to believe that species are mutable will do good service by conscientiously expressing his conviction; for only thus can the load of prejudice by which this subject is overwhelmed be removed.
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