Ontogeny, Fritz Müller and Haeckel on, 270;
predominance of new characters in last stage of, 280, 283.
Ontogeny and Phylogeny of Sphinx-markings, 177.
Ophiuroidea, want of parallelism in, 396.
Orchids, reversion in, 614.
Organic compounds, synthesis of, 643.
Organism, parts independently variable, 514.