Down, description of house and country.
-Darwin's satisfaction with his house.
-instances of vitality of seeds recorded from.
-method of determining plants at.
-Darwin on geology of.
-observations on regular lines of flight of bees at.

Down (lanugo), on human body.

Dropmore.

Drosera, F. Darwin's experiments.
-"a disguised animal."
-Darwin's observations on.
-Darwin's pleasure on proving digestion in.
-effect of inorganic substance on.
-experiments on absorption of poison.
-Pfeffer on.
-J. Scott's paper on.
-response to stimuli.
-D. filiformis, experiments on.
-D. rotundifolia, experiments on.

Drosophyllum, vernation of.
-Darwin's work on.
-Drosophyllum lusitanicum, sent by Tait to Darwin.
-used in Portugal to hang up as fly-paper.

Druidical mounds, seeds from.

Drummond, J., on fertilisation in Leschenaultia formosa.

Duchesne, on atavism.

Ducks, period of hatching.
-skeletons.
-hybrids between fowls and.

Dufrenoy, Pierre Armand: published "Memoires pour servir a une
Description Geologique de la France," as well as numerous papers in the
"Annales des Mines, Comptes Rendus, Bulletin Soc. Geol. France," and
elsewhere on mineralogical and geological subjects.
-geological work of.

Duncan, Rev. J., encourages J. Scott's love for plants.

Dung, plants germinated from locust-.

Dutrochet, on climbing plants.

Duval-Jouve, on leaf-movement in Bryophyllum.

Dyer, see Thiselton-Dyer.

Dytiscus, as means of dispersal of bivalves.

Ears, loss of voluntary movement.
-in man and monkeys.
-rudimentary muscles.
-Wallis's work on.

Earth, age of the.

Earth-movements, cause of.
-in England.
-relation to sedimentation.
-subordinate part played by heat in.

Earthquakes, coincidence of shocks in S. America and elsewhere.
-connection with elevation.
-connection with state of weather.
-Darwin on.
-in England.
-frequency of.
-Hopkins on.
-in Scotland.

Earthworms, Darwin's book on.
-geological action of.
-influence of sea-water on.
-F. Muller gives Darwin facts on.
-Typhlops and true.

Echidna, anomalous character of.

Edentata, migration into N. America.

Edgeworth, mentioned.

Edinburgh, Darwin's student-days in.
-Hooker's candidature for Chair of Botany.

"Edinburgh Review," article on Lyell's "Antiquity of Man."
-reference to Huxley's Royal Institution Lectures.
-Owen's article.

Education, effect of