Persica intermedia, i. 338.
Persistence of colour in horses, i. 50;
of generic peculiarities, i. 111.
Peru, antiquity of maize in, i. 320;
peculiar potato from, i. 331;
selection of wild animals practised by the Incas of, ii. [207]-[208].
"Perücken-Taube," i. 154.
Petals, rudimentary, in cultivated plants, ii. [316];
producing pollen, ii. [392].
Petunias, multiple origin of, i. 364;