En este ensayo polémico, Herbert Spencer establece los principios de su filosofía evolutiva, esbozando la idea de que toda la naturaleza evoluciona en una dirección positiva hacia la perfección. Con su estilo claro y su enfoque científico, Spencer desafía las creencias religiosas de su época y argumenta que la evolución es una ley natural que rige el mundo entero.

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.