The Variation of Animals and Plants under Domestication · Charles Darwin
POTATO, 9 (2);
PRICHARD, Dr., on polydactylism in the negro, 12; —on the Lambert family, 14; —on an albino negro, 21; —on Plica polonica, 23. —double, rendered single by transplantation, 18. _Primula,_ intercrossing of species of, 10; —contabescence in, 18; —‘hose in hose,’ 10; —with coloured calyces, sterility of, 18. _Primula sinensis,_ variations, 10; —reciprocally dimorphic, 17. _Primula veris,_ 12, 16. _Primula vulgaris,_ 12, 16. PRINCE, Mr., on the intercrossing of strawberries, 27. PRINGSHEIM, on conjugation, 27. _Procyon,_ sterility of, in captivity, 18. PROLIFICNESS, increased by domestication, 19. PROTOZOA, reproduction of the, 27. _Prunus armeniaca,_ 10 (2). _Prunus avium,_ 10. _Prunus cerasus,_ 10 (2). _Prunus domestica,_ 10. _Prunus insititia,_ 10. _Prunus spinosa,_ 10. PRUSSIA, wild horses in, 2. _Psittacus erithacus,_ 18. _Psittacus macoa,_ 18. _Psophia,_ general sterility of, in captivity, 18. PTARMIGAN fowls, 7. _Pulex penetrans,_ 23.
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