on the duration of life, [7], [10];
on the essential meaning of sexual propagation, [11], [103], [135], [141];
on natural selection as the origin of sexual reproduction, [14];
on Prof. Vines’ criticism, [14], [90], [99], [178] et seq.;
on the Protozoa and natural selection, [15], [102];
on Lamarck, [16];
on adaptive development, [19];
and natural selection, [21];
summary of theory of germ-plasm, [23];
theory of organic evolution, [26], [48], [50], [58], [66], [68], [87], [100], [104], [106-108], [114-115], [147];