Pityriasis versicolor, inheritance of, ii. [79].
Planchon, G., on a fossil vine, i. 332;
sterility of Jussiæa grandifiora in France, ii. [170].
Plane tree, variety of the, i. 362.
Plantigrade carnivora, general sterility of the, in captivity, ii. [151].
Plants, progress of cultivation of, i. 305-312;
cultivated, their geographical derivation, i. 311;
crossing of, ii. [98], [99], [127];
comparative fertility of wild and cultivated, ii. [112]-[113];