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On the Fourfold Root of the Principle of Sufficient...

PHYSIOLOGY OF PLANTS.

Project Gutenberg EPUB3 edition Schopenhauer, Arthur and Hillebrand, Karl, Mme.

Source attribution

On the Fourfold Root of the Principle of Sufficient Reason, and On the Will in Nature: Two Essays (revised edition), Project Gutenberg eBook #50966

COMPARATIVE ANATOMY. PHYSICAL ASTRONOMY.