Idioplasm, [174], [184], [192], [341];

not identical with nucleoplasm, [180];

relation to chromatin, [217];

two kinds of, [245];

various combinations of, [276].

Imago, length of life of, [16].

Immortality, injurious to species, [24];

of unicellular organisms, [25], [27], [33].

Infusoria, immortality of, [25], [72];

regeneration of lost parts in, [27], [185];