Eine optimistische Philosophie. Eingefuhrt durch Wilhelm Ostwald. 20 text illus. 399pp. 8vo, cloth, spine ends and corners rubbed. Leipzig, 1904. First Edition in German.
Translation of Etudes sur la nature humaine: essai de philosophie optimiste, by the famous Russian zoologist and bacteriologist, and the 1908 Nobel Prize winner. It was the first in a series of books and lectures between 1903 and 1910 in which Metchnikoff developed his thoughts on the prolongation of life. DSB IX 334-35.