[4] The disappearance of species in time raises difficulties in more than one way for his philosophy; but he formally escapes refutation by the suggestion, already noted, that the Idea need not always be manifested phenomenally in the same world. This, however, he did not work out.
[5] Cited in one of the introductory essays to Jowett and Campbell's edition, vol. ii.
[6] De Sollertia Animalium, 27.
SELECTED WORKS
English Translations
The World as Will and Idea. Translated by R. B. Haldane and J. Kemp. 3 vols. 1883-6.
Two Essays: I. On the Fourfold Root of the Principle of Sufficient Reason. II. On the Will in Nature. Bohn's Philosophical Library, 1889.
Religion: A Dialogue, and other Essays. Selected and translated by T. Bailey Saunders. 3rd ed., 1891. [A series of other volumes of selections excellently translated by Mr. Saunders has followed.]