This controversial treatise on the dangers of vaccination, written by British physician Tenison Deane in 1889, caused a firestorm of debate in the medical community of the day. Deane argues that vaccination is an unsafe and scientifically unsound practice, and provides a detailed critique of the prevailing medical wisdom of his time. A must-read for anyone interested in the history of medicine or the ongoing debates over vaccination and public health. 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.