Physiology, both of plants and animals, psycho-physiology, and the psychological faculties of man and animals are so many branches of knowledge requiring more data of the simplest description.
Petr Alekseevich Kropotkin: “Physiology, both of plants and animals, psycho-physiology, and the psychological faculties of man and animals are so…”
Editor's note · Context
Kropotkin identifies various branches of knowledge that require more foundational data for advancement.
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