Dr. Louis BÜchner, president of the medical association of Hessen-Darmstadt, etc., etc., is not only a man of science but a popular writer. Perhaps no book of its class, in our day, has been so widely circulated as his volume on "Kraft und Stoff," Matter and Force. It has been translated into all the languages of Europe. He holds that matter and force are inseparable; there cannot be the one without the other; both are eternal and imperishable; neither can be either increased or diminished; life originated spontaneously by the combination of molecules of matter under favorable conditions; all the phenomena of the universe, inorganic and organic, whether physical, vital, or mental, are due to matter and its forces. Consequently there is no God, no creation, no mind distinct from matter, no conscious existence of man after death. All this is asserted in the most explicit terms. Dr. BÜchner has published a work on Darwinism in two volumes. Darwin's theory, he says, "is the most thoroughly naturalistic that can be imagined, and far more atheistic than that of his decried predecessor Lamarck, who admitted at least a general law of progress and development; whereas, according to Darwin, the whole development is due to the gradual summation of innumerable minute and accidental operations."[27]