First published in 1877, this book explores the concept of vital force, which was a popular topic in medical and philosophical circles at the time. Dunham argues that this force is what separates living organisms from non-living matter and that a proper understanding of it is crucial for maintaining good health. Although some of the scientific ideas presented in this book are outdated, it remains a fascinating glimpse into the medical theories of the past. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.