This brief but informative paper presents the results of experiments on the estimation of iodine in a range of substances, including seawater and mineral salts. Aimed at a specialist audience of chemists and geologists, the author's rigorous methodology and clear, concise language make this an important contribution to the history of scientific research in the mid-19th century.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.