He was also the author of Science et philosophie (1886), which contains a well-known letter to Renan on "La Science ideale et la science positive," of La Revolution chimique, Lavoisier (1890), of Science et morale (1897), and of numerous articles in La Grande Encyclopedie, which he helped to establish.
Other philosophical works were: - Ueber den Ursprung der Sitten (1860 and 1867), Ueber die Ideen in der Geschichte (1865 and 1872); Zur Lehre von den Sinnestauschungen (1867); Ideale Fragen (1875 and 1885), Erziehung and Geschichte 0880; Unser Stand punkt (1881); Ueber die Reize des Spiels (1883).
In 1881 he published a work on monasticism, Das M onchtum, seine Ideale and seine Geschichte (5th ed., 1900; English translation, 1901), and became joint-editor with Emil Schiirer of the Theologische Literaturzeitung.
4, 1882), Harnack, Das Monchthum, seine Ideale and seine Geschichte, 2nd ed., 1882; Eng.
In pieces such as Liszt's " Poemes symphoniques," Ce qu'on entend sur la montagne (1848-1856), after a poem by Victor Hugo, and Die Ideale (1853-1857), after a poem by Schiller, the hearer is bewildered by a series of startling orchestral effects which succeed one another apparently without rhyme or reason.
Die Ideale; Zwei Episoden aus Lenau's Faust: I.