This book is a practical guide to the microscopical examination of drinking water, with a particular focus on the detection of harmful microorganisms and contaminants. It includes detailed instructions on how to prepare and examine water samples using a microscope, as well as an appendix on the examination of air samples. It is an indispensable resource for anyone involved in the testing and analysis of drinking water. 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.