Ontogeny, recapitulates phylogeny, 63.
Orang-outang, 163, 164.
Orders, 32.
Organic, 15;
systems, 17;
transformation, analogies of, 43,
a real and natural process, 55, 56, 76;
mechanism, alteration of, 55.
Organisms,
living, 14;
analysis of, 16; 17, 18, 19, 26, 28, 29, 31, 32;
characteristic early stages, 55;
are they adapted by circumstances? 109;
environment, 111;
physical heritage of, 113;
variation of, 119;
difference, 121;
universal conflict of, 127;
change, 130;
human, 32, 156, 159, 165-171;
nervous system of, 201;
psychical characteristics of, 202;
many-celled, 257.
Organs, 16, 17, 28;
of human body, 156.
Origin of Species, 136, 149.
Origination of new parts, 109.
Osborn, 148.
Ostrich, 44.