queria, F. Muller's paper on.

Potatoes, crossing experiments.
-cultivated and wild.
-disease of.
-experiments suggested.
-graft-hybrids.
-sterility and variability in.
-Torbitt's experiments on.
-Traill's experiments.
-varieties of.
-Darwin's work on varieties of.
-Hildebrand's experiments on.

Poulton, Prof., on Prichard as an evolutionist.
-"Charles Darwin and the Theory of Natural Selection."

Poultry, skulls of.
-Tegetmeier's book on.
-experiments on colour and sexual selection.

Powell, Prof. Baden.

"Power of Movement in Plants," Darwin's account of capacity of revolving
in plants, in his book.
-Continental opinion of.
-Wiesner's criticism of.

Prawns, F. Muller on metamorphosis of.

Prayer, Galton's article on.

Pre-Cambrian rocks, Hicks on.

Predominant forms.

"Prehistoric Europe," J. Geikie's.

"Prehistoric Times," Lord Avebury's.

Preordination, speculation as to.

Prepotency of pollen.

Prescott, reference to work by.

Preservation, suggested as an alternative term for Natural Selection.

Pressure, effect on liquefaction by heat.

Preston, S. Tolver, letter to.

Prestwich, Prof. J., letter to.
-on Parallel Roads of Glen Roy.
-on superficial deposits of S. England.
-work on Tertiaries.
-mentioned.

Prevost, C., as candidate for Royal Society Foreign List.
-mentioned.

Price, J., extract from letter from Darwin to.

Prichard, James Cowles (1786-1848): He came on both sides from Quaker
families, but, according to the "Encyclopaedia Britannica," he
ultimately joined the Church of England. He was a M.D. of Edinburgh,
and by diploma of Oxford. He was for a year at Trinity College,
Cambridge, and afterwards at St. John's and New College, Oxford, but did
not graduate at either University. He practised medicine, and was
Physician to the Infirmary at Bristol. Three years before his death he
was made a Commissioner in Lunacy. He not only wrote much on Ethnology,
but also made sound contributions to the science of language and on
medical subjects. His treatise on insanity was remarkable for his
advanced views on "moral insanity."
-on immutability.
-quotations from his "Physical History of Mankind."

Priestley, "Green matter" of.
-Huxley's essay on.

Primogeniture, antagonistic to Natural Selection.

Primrose (see also Primula), Darwin's experiments on cowslip and.
-dimorphism of.
-J. Scott on.

Primula,