This book collects letters that discuss homeopathy, a system of alternative medicine based on the principle of 'like cures like, ' as well as a lecture on the life and instincts of organisms. It includes information on the history and practice of homeopathy, and it explores the relationship between organism and environment. This book is perfect for anyone interested in alternative medicine or the philosophy of science. 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.