I. Haeckel and His Opponents

Under the influence of the theory of descent, science is ever drawing nearer to that great goal which one of the greatest scientists of the century, Karl Ernst von Baer, has depicted in the words: “It is one fundamental thought which runs through all forms and stages of animal evolution and dominates all particular conditions. It is the same fundamental thought which gathered together the scattered masses of the spheres in universal space and formed them into solar systems; the same thought caused the disintegrated dust on the surface of the planet to sprout forth into living forms. But this thought is nothing else but Life itself, and the words and syllables wherein it expresses itself are the various forms of that which lives.” Another utterance of Baer's gives the same conception in another form: “To many another will a prize fall. But the palm will be won by the fortunate man for whom it is reserved to trace back the formative energies of the animal body to the general forces and vital functions of the universe as a whole.”