LUDWIG BÜCHNER, celebrated as a scientist and essayist on philosophical subjects, was born at Darmstadt, Germany, March 28th, 1824. Educated at the universities of Giessen, Wartburg, and Vienna, he began his professional life as a lecturer at Tübingen where he remained until the radical views of his “Force and Matter” (Kraft und Stoff) led to his retirement. In this work which has been translated into most European languages, he taught “the eternity of matter, the immortality of force, the universal simultaneousness of light and life, and the infinity of forms of being in time and space.” It may be more intelligible to add that the book was generally accepted as an expression of the most advanced materialism. Among Doctor Büchner’s other works are “Nature and Spirit,” “Physiologische Bilder,” and “Man’s Place in Nature.”