iation in.
-bright colours of fruits and.
-difficulty of finding in samples of earth.
-dormant state of.
-germination from pond mud.
-Hildebrand on dispersal of.
-mucus emitted by.
-stored by ants.
-supposed vivification of fossil.
-vitality of.

Seeley, Prof.

Seemann, on commingling of temperate and tropical plants in mountains of
Panama.
-on the "Origin" in Germany.
-mentioned.

Segregation of minerals in foliated rocks.

Selaginella, foot of, compared with organ in Welwitschia seedling.

Selection, a misleading term.
-artificial.
-as means of improving breeds.
-importance of.
-influence of speedy.
-utilised by pigeon-fanciers.
-Sexual (see Sexual Selection).
-sterility and.
-unconscious.
-and variation.
-voluntary.
-and inheritance.

Self-fertilisation, abundance of seeds from.
-Darwin's experiments on cross- and.
-evil results of.
-comparison between seeds from cross- and.
-in Goodeniaceae.
-in Orchids.

Self-interest, Preston on.

Self-sterility, in Eschscholtzia.
-in plants.
-connection with unnatural conditions.

Selliera, Hamilton on fertilisation-mechanism.

Semper, Karl (1832-93): Professor of Zoology at Wurzburg. He is known
for his book of travels in the Philippine and Pelew Islands, for his
work in comparative embryology, and for the work mentioned in the above
letter. See an obituary notice in "Nature," July 20th, 1893, page 271.
-letter to.

Senecio.
-S. vulgaris, profits by cross-fertilisation.

Sensitive plants, Darwin's work on.

Sensitiveness, diversified kinds in allied plants.

Separate creations, Darwin on.

Sequoia.

Seringe, on Aconitum flowers.

Sertularia.

Sethia, dimorphism of.

Settegast, H., letter to.

Severn, Darwin on floods of.

Seward, A.C., "Fossil Plants as Tests of Climate."

Sexes, colour, and difference in.
-proportion at birth.
-proportion in animals.

Sexual likeness, secondary.

Sexual organs, as collectors of generative elements.
-appendages in insects complemental to.

Sexual reproduction, Galton on.
-bearing of F. Muller's work on essence of.

Sexual Selection, Bates on.
-Darwin on.
-article in "Kosmos" on.
-colour and.
-man and.
-in moths and butterflies.
-subordinate to Natural Selection.
-Wallace on colour and.
-Wallace on difficulties of.

Sexuality, Bentham on.
-in lower forms.
-origin of.

Shanghai, tooth of Mastodon from.