This is a biographical account of John LeConte (1818-1891), written by his brother Joseph LeConte, himself a noted scientist. The memoir delves into the life and work of John LeConte, offering insights into his contributions to science and education during the 19th century. It provides a detailed look at his career, personal life, and the intellectual environment in which he operated. "Memoir of John LeConte" offers a valuable historical perspective on American science and the life of a prominent figure in the field. 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 was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. 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. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. 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.