Nägeli, [56].

Nitzsch, Karl Immanuel, [361].

Noiré, Ludwig, [281].

Oken, [34], [320].

Owen, Richard, [35], [56], [164], [176], [221], [223], [320].

Peschel, Oskar, [279].

Pfaff, [54].

Pfleiderer, Otto, [187].

Planck, Carl Ch., [105], [110].

Preyer, [136], [146], [153].