This timeless classic from 1758 is still as relevant today as it was over 200 years ago. Carl Linnaeus's revolutionary system of classifying living things forms the foundation of modern taxonomy. This edition includes all three volumes of the 13th edition of his Systema Naturae, along with four appendices containing additional material. A must-have for any naturalist or biologist. 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.