Louis Agassiz was one of the most influential naturalists of the 19th century, and this collection of his essays provides a fascinating look at the state of natural history in his time. From the study of ancient fossils to the exploration of the Arctic, Agassiz's work helped to shape our understanding of the natural world. 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.