osa_, i. 345.
PRUSSIA, wild horses in, i. 60.
_Psittacus erithacus_, ii. 155.
_Psittacus macoa_, ii. 155.
_Psophia_, general sterility of, in captivity, ii. 157.
PTARMIGAN fowls, i. 228.
_Pulex penetrans_, ii. 275.
PUMPKINS, i. 357.
PUNO ponies of the Cordillera, i. 52.
PURSER, Mr. on _Cytisus Adami_, i. 389.
PUSEY, Mr., preference of hares and rabbits for common rye, ii. 232.
PUTSCHE and Vertuch, varieties of the potato, i. 330.
PUVIS, effects of foreign pollen on apples, i. 401;
supposed non-variability of monotypic genera, ii. 266.
_Pyrrhula vulgaris_, ii. 232;
assumption of the hen-plumage by the male, in confinement, ii. 158.
PYRRHUS, his breed of cattle, ii. 202.
_Pyrus_, fastigate Chinese species of, ii. 277.
_Pyrus acerba_, i. 348.
_Pyrus aucuparia_, ii. 230.
_Pyrus communis_, i. 350, 376.
_Pyrus malus_, i. 348, 376.
_Pyrus paradisiaca_, i. 348.
_Pyrus praecox_, i. 348.

QUAGGA, effect of fecundation by, on the subsequent progeny of a mare, i.
403-404.
QUATREFAGES, A. de, on the burrowing of a bitch to litter, i. 77;
{473}
selection in the silkworm, i. 301;
development of the wings in the silkmoth, i. 303, ii. 298;
on varieties of the mulberry, i. 334;
special raising of eggs of the silkmoth, ii. 197;
on disease of the silkworm, ii. 228;
on monstrosities in insects, ii. 269, 391;
on the Anglo-Saxon race in America, ii. 276;
on a change in the breeding season of the Egyptian goose, ii. 304;
fertilisation of the _Teredo_, ii. 363;
tendency to similarity in the best races, ii. 241;
on his "_tourbillon vital_," ii. 61;
on the independent existence of the sexual elements, ii. 360.
_Quercus cerris_, i. 363.
_Quercus robur_ and _pedunculata_, hybrids of, ii. 130.
QUINCE, pears grafted on the, ii. 259.

RABBITS, domestic, their origin, i. 103-105;
of Mount Sinai and Algeria, i. 105;
breeds of, i. 105-111;
Himalayan, Chinese, Polish, or Russian, i. 108-111, ii. 97;
feral, i. 111-115;
of Jamaica, i. 112;
of the Falkland islands, i. 112;
of Porto Santo, i. 112-115, ii. 103, 279;
osteological characters of, i. 115-129;
discussion of modifications in, i. 129-130;
one-eared, transmission of peculiarity of, ii. 12;
reversion in feral, ii. 33;
in the Himalayan, ii. 41;
crossing of white and coloured Angora, ii. 92;
comparative fertilit