Old characters, reappearance of.
Oldenburgia.
Oldenlandia.
Olfers.
Oliver, D., Darwin indebted to for information. -letters to. -mentioned.
Olyra, sleep-movements of.
Omori, Morse on shell-mounds of.
Oncidium, J. Scott's work on. -structure of labellum. -O. flexuosum, observations by Muller and Scott on. -self-sterility of. -O. sphacelatum, Scott on fertilisation of.
Ophrys. -O. apifera, fertilisation-mechanism. -self-fertilisation of. -O. arachnites, fertilisation of. -habitat. -O. aranifera. -O. morio, fertilisation of. -O. muscifera, Lord Farrer's observations on. -O. scolopax.
Opossums.
Oppel, service to geology. -mentioned.
Opuntia, Henslow describes new species from Galapagos.
Orang-utang, Rolleston on brain of. -Wallace on.
Orange trees, grafting of.
d'Orbigny, on geology of S. America. -theory of formation of Pampas mud. -"Voyage dans l'Amerique meridionale. -mentioned.
Orchids, adaptation in. -Darwin's work on. -Darwin's view that seedlings are parasitic on Cryptogams. -Falconer's estimate of Darwin's work on. -few species in humid temperate regions. -flourish in cool temperate regions. -illustrate diversity of means to same end. -monstrous. -quoted as argument against species arising from monstrosities. -utility and. -fertilisation mechanisms of. -Brazilian. -Darwin decides to publish his work in book-form. -Darwin sends copy of his book to F. Muller. -Darwin underrates power of producing seeds without insects. -French translation of Darwin's book. -germinative power of pollen. -Hildebrand's paper on. -Nectar not excreted in some English. -and nectar secretion. -formation of ovule after pollination. -Scott points out error in Darwin's work. -Scott on pollen-tubes of. -Scott on self-sterility. -self-fertilisation in. -setting of seed in unopened flower. -sterility of. -course of vessels in flowers. -wonderful contrivances intelligible.
Orchis, flowers of. -nectaries of. -pollinia of.
Orchis (Bee) (see also Ophrys apifera), Darwin's experiments on. -O. pyramidalis, fertilisation mechanism. -O. ustulata.
Order of Nature.
Ordination.
Organ mountains, Darwin on plants of. -glacial action on.
Organisms, simultaneous change in. -amount of change in fresh water and marine.
Organs, transition of -use of.
"Origin of the Fittest," Cope's.
"Origin of Genera," Cope's work on.
Origin of life.
"Origin of Species," acceptance of doctrine of Evolution due to the. -Darwin's belief in the permanence of the framework of the. -Darwin's opinion of his book. -Dawson's review of. -direct action underestimated in the. -editions of the. -errors in. -Falconer's estimate of. -Huxley's Cambridge speech, and reference to the. -Huxley's lecture on coming of age of. -Huxley's review of. -Lesquereux's articles in "Silliman" against the. -publication of the Abstract of. -publication by Murray of. -sale of the. -Seemann on the. -translation of. -Wallace's criticism of. -Walsh on the. -Darwin on necessity for modifications in the. -review by Fleeming Jenkin. -review by A. Murray. -Owen's criticism of Darwin's Historical Sketch in 4th edition of. -Owen's review of. -study of natural history revolutionised by the. -valueless criticism on.
Origin of species, Darwin's early views on. -Darwin's views on. -Falconer antagonistic to Darwin's views on. -Oxford discussion (British Association, 1860) on the. -spread of Darwin's views in America.
Origin of species and genera, Wallace in the "Nineteenth Century" on.
Original work, time taken up by, at expense of reading.
Ormerod's Index to the Geological Society's Journal.
Ornithorhynchus, aberrant nature of. -preservation of.
Orthoptera, auditory organs of.
Oscillariae, abundance in the ocean.
Oscillataria.
Oscillation of land, Darwin's views on.
Os coccyx, as rudimentary organ.
Ostrea.
Ostrich, modification of wings.
Outliers, plants as.
"Outlines of Cosmic Philosophy," Fiske's.
Ovary, abnormal structure in orchid.