Heterosmilax, de Candolle on.

Heterostylism, Darwin's experiments on.
-example in monocotyledons of.

Hewitt, on pheasant-hybrids.
-mentioned.

Hibiscus.

Hicks, H., on pre-Cambrian rocks.

Hieracium, American species.
-Nageli on.
-variability of.

Highness, lowness and.

Hilaire, A. St., see St. Hilaire.

Hildebrand, F., article in "Botanische Zeitung."
-experiments on direct action of pollen.
-"Die Lebensdauer der Pflanzen."
-letter to.
-crossing work by.
-on Delpino's work.
-on dispersal of seeds.
-self-sterility in Corydalis cava.
-"Geschlechter-Vertheilung bei den Pflanzen."
-on orchids.
-on ovules formed after pollination.
-experiment on potatoes.
-on Salvia.
-mentioned.

Hilgendorf, controversy with Sandberger.

Hillebrand's Flora of the Hawaiian Islands.

"Himalayan Journals," dedicated by Hooker to Darwin.

"Himalayan Plants, Illustrations of."

Himalayas, British plants in.
-commingling of temperate and tropical plants.
-tortoise of.
-ice-action in.
-mixed character of the vegetation.

Hinde, Dr., examination of Funafuti coral-reef cores by.

Hindmarsh, L., letter to.

Hippeastrum, Herbert on self-sterility of.

Hippopotamus, fossil in Madagascar.

Historic spirit, J. Morley's criticism of Darwin's lack of.

Hitcham, collection of Azorean plants made near.

Hobhouse, Sir A., Darwin meets.

Hochberg, K., letter to.

Hofmann, A.W., receives royal medal.

Holland, evolutionary opinions in.
-flora of.

Holland, Sir H., on pangenesis.
-mentioned.
-on influence of mind on circulation.

Holly, effective work of insects in fertilisation of.

Hollyhock, Darwin's crossing experiments.

Holmsdale.

Home, see Milne-Home.

Homing experiments.

Homo, Pithecus compared with.

Homology, analogy and.
-course of vessels in flowers as guide to.

Homomorphic, use of term.

Honeysuckle, oak-leaved variety.

Hooker, Mrs., assists Sir J.D. Hooker.

Hooker, Sir J.D., addresses at British Association meetings.
-on Arctic plants.
-Australian Flora by.
-botanical appointment.
-C.B. conferred upon.
-on coal plants and conditions of growth.
-criticism on Lyell's work.
-on Darwin's MS. on geographical distribution.
-Darwin's admiration for letters of.
-Darwin assisted in his work by.
-Darwin on good gained by "squabbles" with.
-Darwin on success of.
-enjoyment of correspondence with Darwin.
-exped