Turgut Dincer and the Online Distributed Proofreading Team at http://www.pgdp.net (This file was produced from images generously made available by The Internet Archive) The present writer contributed a somewhat lengthy preface and also an appendix to the translation of the author’s earlier volume, The Play of Animals, mainly because—apart from the expressed wish of Professor Groos—he wanted to say something about the book. It is a pleasure to him now to have the justification for it which comes from the adoption by Professor Groos in this volume of the suggestions made in the translation of the earlier one. The main points have all been accepted and used by the author (see pp. 265, 376, 395…
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