"The Theory of Environment" is a scholarly book that examines the history of the term "milieu" and its current status. This unchanged, high-quality reissue of the original edition offers deep insights into the development and current perspectives of the topic. Published by Hansebooks, a publisher specializing in the preservation of historical literature, this work is regarded as a valuable resource for students and professionals in the fields of mathematics and natural sciences. Hansebooks is dedicated to republishing rare and historical texts to preserve their knowledge for future generations. This book exemplifies the publisher's commitment to making significant scientific works accessible and highlighting the relevance of historical ideas in today's context.