-impotence in the, ii. 137;
sterility of, ii. 169;
advantage of change of soil to the, ii. 146;
relation of tubers and flowers in the, ii. 343.
POTATO, sweet, sterility of the, in China, ii. 169;
varieties of the, suited to different climates, ii. 309.
POUCHET, M., his views on plurality of races, i. 2.
POUTER pigeons, i. 137-139;
furcula figured, i. 167;
history of, i. 207.
POWIS, Lord, experiments in crossing humped and English cattle, i. 83,
ii. 45.
POYNTER, Mr., on a graft-hybrid rose, i. 396.
PRAIRIE wolf, i. 22.
PRECOCITY of highly-improved breeds, ii. 321.
PREPOTENCY of pollen, ii. 187.
PREPOTENCY of transmission of character, ii. 65, 174;
in the Austrian emperors and some Roman families, ii. 65;
in cattle, ii. 65-66;
in sheep, ii. 66;
in cats, _ibid._;
in pigeons, ii. 66-67;
in fowls, ii. 67;
in plants, _ibid._;
in a variety of the pumpkin, i. 358;
in the jackal over the dog, ii. 67;
in the ass over the horse, _ibid._;
in the pheasant over the fowl, ii. 68;
in the penguin duck over the Egyptian goose, _ibid._;
discussion of the phenomena of, ii. 69-71.
PRESCOTT, Mr., on the earliest known European flower-garden, ii. 217.
PRESSURE, mechanical, a cause of modification, ii. 344-345.
PREVOST and Dumas, on the employment of several spermatozoids to
fertilise one ovule, ii. 363.
PRICE, Mr., variations in the structure of the feet in horses, i. 50.
PRICHARD, Dr., on polydactylism in the negro, ii. 14;
on the Lambert family, ii. 77;
on an albino negro, ii. 229;
on Plica polonica, ii. 276.
PRIMROSE, ii. 21;
double, rendered single by transplantation, ii. 167.
_Primula_, intercrossing of species of, i. 336;
contabescence in, ii. 166;
hose and hose, i. 365;
with coloured calyces, sterility of, ii. 166.
_Primula sinensis_, reciprocally dimorphic, ii. 132.
_Primula veris_, ii. 21, 109, 182.
_Primula vulgaris_, ii. 21, 109.
PRINCE, Mr., on the intercrossing of strawberries, i. 352.
_Procyon_, sterility of, in captivity, ii. 152.
PROLIFICACY, increased by domestication, ii. 174.
PROPAGATION, rapidity of, favourable to selection, ii. 297.
PROTOZOA, reproduction of the, ii. 376.
_Prunus armeniaca_, i. 344-345.
_Prunus avium_, i. 347.
_Prunus cerasus_, i. 347, 375.
_Prunus domestica_, i. 345.
_Prunus insititia_, i. 345-347.
_Prunus spin