PRIMROSE. -double, rendered single by transplantation.
Primula, intercrossing of species of. -contabescence in. -'hose in hose.' -with coloured calyces, sterility of.
Primula sinensis, variations. -reciprocally dimorphic.
Primula veris.
Primula vulgaris.
PRINCE, Mr., on the intercrossing of strawberries.
PRINGSHEIM, on conjugation.
Procyon, sterility of, in captivity.
PROLIFICNESS, increased by domestication.
PROTOZOA, reproduction of the.