PARTRIDGE, sterility of, in captivity.
PARTURITION, difficult, hereditary.
Parus major.
Passiflora, self-impotence in species of. -contabescence of female organs in.
Passiflora alata, fertility of, when grafted.
PASTRANA, Julia, peculiarities in the hair and teeth of.
PASTURE and climate, adaptation of breeds of sheep to.
PATAGONIA, crania of pigs from.
PATAGONIAN rabbit.
PATERSON, R., on the Arrindy silk-moth.