Parthenogenesis, ii. [359], [364].
Partridge, sterility of, in captivity, ii. [156].
Parturition, difficult, hereditary, ii. [8].
Parus major, ii. [231].
Passiflora, self-impotence in species of, ii. [137]-[138];
contabescence of female organs in, ii. [166].
Passiflora alata, fertility of, when grafted, ii. [188].
Pasture and climate, adaptation of breeds of sheep to, i. 96, 97.
Pastrana, Julia, peculiarities in the hair and teeth of, ii. [328].
Patagonia, crania of pigs from, i. 77.