Polar bodies, Weismann on, 40, 46, 125;
examination of Weismann’s explanation of, 42;
O. Hertwig on, 46, 125.
Protophyta, natural selection and, 114.
Protozoa, immortality of, 7;
and natural selection, 15, 114;
origin of species of, 15, 102;
action of environment on, 15;
Maupas on, 101.
R.
Regeneration, in sea-anemones and jelly-fish, 4, 35;
of an entire organism, 34;
Weismann on, 51 _et seq._;
in Begonia, 52;
Rev. G. Henslow on, 53;
and stirp, 59.
Rejuvenescence, 166.
Representative congenital changes, 65.
Reproduction, essential meaning of sexual, 8, 11;
in the Protozoa, 16;
somatic, 35.
Reproductive elements, potential immortality of, 9;
of Vertebrates and Plants, 74.
Reversion, 3, 91, 105.
=Roux=, on the principle of “struggle,” 139.
S.
Sea-anemones, regeneration in, 4.
Sexual apparatus of Invertebrates, Weismann on, 72, 74.
Sexual-cells and somatic-cells, 75-77, 81, 84.
Sexual propagation, essential meaning of, 8, 11, 87;
sole cause of congenital variations, 12, 89-90, 102, 135, 141, 153,
158;
did not arise through the agency of natural selection, 13-14;
in multicellular organisms, 51;
Galton on the origin of, 103;
in _Cytisus adami_, 127.
Significance of sexual reproduction, _see_ Sexual Reproduction.
Somatic-cells, nucleo-plasm of, 30;
and sexual cells, 75-77, 81, 84.
Somatic-idio-plasm, 32-33;
and germ-plasm, 69.
Somatic reproduction, 35, 52.
Somato-plasm and germ-plasm, 29.
Specialized congenital changes, 65.
Species, Weismann on the origin of new, 100-101.
=Spencer, Herbert=, theory of heredity, 2;
on Telegony, 191 _et seq._
Stability of germ-plasm, _see_ Germ-plasm.
Stirp, and gemmules, 58-59, 61;
and somatic tissues, 60;
and the germinal cells of Hydromedusae, 73;
and germ-plasm, 75, 92, 106, 133.
=Strasburger=, on Weismann’s theory of heredity, 51;
on the origin of sexual propagation, 167.
_Stylonichia_, Maupas on, 101.
Summary, 103.
T.
Telegony, 77-79, 110, 141 _et seq._, 191 _et seq._
Transmission of acquired characters, _see_ Acquired characters.
Twins, identical, 41.
U.
Unicellular organisms, reproduction of, 16;
action of environment on, 23, 147 _et seq._;
potentially immortal, 23;
natural selection and the, 24, 57, 114;
and the origin of hereditary individual variations, 100.
V.
Variation, _see_ Congenital variations, Acquired characters, &c.;
Darwin on the causes of, 102;
Weismann on the origin of, 153.
Vertebrates, reproductive cells of, 74.
Vestigial organs, persistence of, 91.
=Vines, Prof. S.=, criticism on Weismann, 14, 75, 90, 99, 152, 178;
on the Basidiomycetes, 90.
=Vries, De=, theory of heredity, 2;
on germ-plasm, 54;
on the chromatophores of Algae, 83, 111;
on Xenia, 144.
W.
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