Adaptations, [3], [10], [22], [61], [82].

Adaptiveness, [66] footnote, [67], [74] et seq.

Ageronia, [19].

Anæa, [22].

Anlagen, [35], [47], [53].

Arthropoda, [32], [62].

Articulata, [30].

Artificial selection, [33].

Askenasy, [24], [60], [82].

Atoms, [57], [58].