Pfitzner, on nuclear division, [187].
Pflüger, on heredity, [70], [175], [355];
on the inheritance of acquired characters, [81], [390], [422];
on isotropism of the ovum, [176].
Phanerogams, fertilization of, [178], [247];
development of pollen grains of, [222].
Pheasant, the length of life of the golden, [36].
Philodina, polar bodies of, [350].
Phryganea grandis, [41].
Phylloxera vastatrix, length of life of, [41];