hawks, as agents in seed-dispersal.

Oxalis, bulbils of.
-cleistogamic flowers of.
-dimorphism of.
-pollen-tubes of.
-seeds of.
-trimorphism of.
-O. acetosella, sensitive leaves of.
-variation in length of pistil and stamens.
-O. sensitiva, Darwin's work on.
-O. corniculata, variation of.

Oxford, meeting of the British Association at (1847).
-Tuckwell's reminiscences of.

Oxlips, Darwin's experiment on cowslips, primroses, and.
-Darwin on hybrid character of.
-scarcity of.

Oxyspora paniculata, Wallich on.

Pachira, inequality of cotyledons.
-P. aquatica.

Pacific Ocean, Darwin wishes Hooker to investigate floras of.
-islands of the.
-coral reefs of.

Packard's "Lamarck the Founder of Evolution."

Paget, Sir J., on regeneration.
-address on elemental pathology.
-illness of.
-on influence of mind on nutrition.
-"Lectures on Surgical Pathology."
-letters to.
-mentioned.

Pairing, in birds.
-vigour of birds and effect on time of.

Palaeolithic flints, in gravels near Southampton.

Palaeontology, rapid progress of.

Palaeozoic period.

Paley, idea of interference of Creator in construction of each species
due to.

"Pall Mall," article on "Dr. Hooker on Religion and Science" in.
-letter to editor of.

Pallas, Darwin's conviction of truth of doctrine of.
-doctrine of.
-on hybrids and fertility.

Palm, Malayan climbing.

Palm, L.H., work on climbing plants by.

Palma, crater of.

Pampas, geology of the.
-formation of.
-Lyell on Mississippi beds and.
-D'Orbigny's theory of formation of.
-thistle of the.

Pangenesis, adverse opinion on.
-Bentham on.
-Berkeley on.
-bud-propagation and.
-Darwin on.
-Darwin's suggestion as to term.
-difference between Galton's theory of heredity and.
-evidence from hybridisation in favour of.
-Hooker on.
-Huxley's views on.
-Jager on.
-Lyell on.
-and molecular hypothesis of Hackel.
-Ranyard on.
-Romanes on.
-self-fertilisation and.
-Wallace on.
-the idea a relief to Darwin as connecting facts.
-F. Muller and.
-bearing on regeneration.
-"will turn out true some day."
-mentioned.

Panmixia.

Panniculus carnosus in man.

Papilio Memnon, Wallace on.
-P. nireus, Mrs. Barber on.
-P. pammon, Wallace on.

Papilionaceaous flowers, absence in New Zealand.
-and hermaphroditism.

Papilionidae, Wallace on Malayan.

Paraheliotropism, Muller's observations on.
-i