I. Haeckel and His Opponents

[^3]: In his recently published book, Die Welträtsel, Gemeinverständliche Studien über Monistische Philosophie (Bonn, Emil Strauss, 1899), Haeckel has given without reserve the” further development, proof, and completion of the convictions” which throughout a full generation he has represented. To anyone who has absorbed the scientific knowledge of our time, this work must appear as one of the most important manifestos of the end of the nineteenth century. It contains in ripened form a complete analytical discussion of the relations of modern science with philosophical thinking from the mind of the most original, far-sighted investigator of our time.