Lewis David von Schweinitz was a 19th century scientist who made significant contributions to the fields of botany and mycology. This memoir provides a fascinating look into his life and scientific achievements, and includes a detailed sketch of his labors. This book is a must-read for anyone interested in the history of science or the life of this remarkable scientist. 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.