This classic study of human language was first published in 1836, as a general introduction to Humboldt's treatise on the Kawi language of Java. It is the final statement of his lifelong study of language, exploring its universal structures and its relation to mind and culture. It remains one of the most interesting and important attempts to draw philosophical conclusions from comparative linguistics. This volume presents a modern translation by Peter Heath together with a new introduction by Michael Losonsky that places Humboldt's work in its historical and philosophical context.