Pupa, length of life of, [55].
Rabbit, polar bodies of, [339].
Rauber, on heredity, [172].
Ravens, length of life of, [36].
Regeneration of lost parts, [65];
in Infusoria, [185].
Rejuvenescence, [112], [116], [124], [132], [153], [283].
Reproduction, original form of, [122];