First published in 1872, this groundbreaking study by T. Spencer Cobbold shed new light on the parasitic tapeworm and its impact on human health. Cobbold's dissections of animal hosts, as well as his careful observations of human patients, contributed greatly to the understanding of these tenacious worms. The book also contains a fascinating overview of the history and mythology of parasitic organisms, giving readers a window into the scientific and cultural context of Cobbold's work. 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.