Polar bodies, Weismann on, [40], [46], [125];

examination of Weismann’s explanation of, [42];

O. Hertwig on, [46], [125].

Protophyta, natural selection and, [114].

Protozoa, immortality of, [7];

and natural selection, [15], [114];

origin of species of, [15], [102];

action of environment on, [15];

Maupas on, [101].

R.