Falcons, length of life of, [11], [37].
Fiedler, on polar bodies in sponges, [217].
Flemming, on nuclear division, [187], [231], [359], [361].
Flourens, on length of life, [7].
Fol, on fusion of nuclei, [174], [189];
on origin of ova, [222];
on multiple impregnation, [236], [238], [382];
on polar bodies, [340], [351];
on process of fertilization, [355].
Formica sanguinea and fusca, length of life of, [51].