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].