The book "A Philosophical Grammar of the American Languages, as Expounded by Wilhelm von Humboldt, with a Translation of His Unpublished Memoir on the American Verb" is an important linguistic study written by the famous American philologist Daniel H. Brinton. The author explores the philosophical interpretation of American languages offered by Wilhelm von Humboldt, a prominent German scientist. In his book, Brinton reveals the meaning and features of American languages from the perspective of Humboldt's philosophical analysis. He also offers a translation of Humboldt's own hitherto unknown memoir exploration of the American verb. This book will be a useful resource for linguists, philologists, and anyone interested in the study of American Indian philosophy of language and culture. Daniel G. Brinton successfully combines philological analysis and philosophical thinking, revealing deep connections between language, culture, and ways of thinking. "Philosophical grammar of American languages" opens new horizons for understanding the nature of language and its role in the development of human society.