Julius von Sachs, Vöchting, Noll, and other botanists have successfully opened the way to a knowledge of the growth of plants in their causal conditions. This method has been applied to the physiology of animals by Pflüger. The present pamphlet is a contribution to this endeavor by Dr. Loeb, whose special object has been to determine the laws of the restoration of lost organs in animal organisms. Botanists have found that if a plant that has undergone the loss of an organ has to build it up again, the new organ will be different from the original organ, and this difference can be determined by law. Dr. Loeb inquires whether the same can be said of the reconstruction of the lost organs of animals. There are, as a rule, in animal organisms two poles, viz. the oral pole, forming the head, and the aboral forming the tail. It has been generally supposed that living animal substance possesses the tendency to develop in one special direction oral organs, and in the other aboral organs. This was called Polarity and is based upon the experiments of Allman, Trembley, Dalyell, and others. The experiments of Dr. Loeb, made with the view of testing the polarity theory, show that it is possible to develop in animals possessing physiologically distinct heads and tails, heads instead of tails in the aboral pole, and to do so without any serious interference with the vitality of the creature. The experiments have been made chiefly on _Tubularia mesembryanthemum_, _Aglaophenia pluma_, _Plumularia pinnata_, and other species. Dr. Loeb proves by his experiments that external conditions control the reproduction of organs, so that artificially oral organs can be made to grow where aboral organs have been, and _vice versa_. It is this faculty of animal organisms which Dr. Loeb calls _heteromorphosis_. κρς. DIE ETHISCHE BEWEGUNG IN DER RELIGION. By _Stanton Coit_, Ph. D. Uebersetzung von Georg von Gizycki. Leipsic: O. R. Reisland. This series of Sunday lectures by Dr. Stanton Coit, the speaker of the South Place Ethical Society of London, England, has been translated into German, in the shape it is now before us, by Dr. Coit's friend and teacher Prof. George von Gizycki; they have not yet appeared in English. The South Place Ethical Society is not directly affiliated to the Ethical Societies of North America, but it stands with them in friendly relations. Dr. Coit, a native American, is strongly biased in his views by his American co-workers; he is the youngest among them, and is, I believe, to be considered as a disciple of Professor Adler. He has inherited from Professor Adler the idea that we can have ethics without a world-conception or a religion; yet this idea has been considerably modified, and an approach to more positive and practical views is perceptible in many passages of his sermons.