Books about Language and languages

Primitive culture, vol. 1 (of 2) : Researches into the development of mythology, philosophy, religion, language, art, and custom

Primitive culture, vol. 2 (of 2) : Researches into the development of mythology, philosophy, religion, language, art, and custom

Language: Its Nature, Development and Origin

Lectures on the Science of Language

Language: An Introduction to the Study of Speech

Opuscula: Essays chiefly Philological and Ethnographical

The Origin of Thought and Speech

Philological Proofs of the Original Unity and Recent Origin of the Human Race

Introduction to the science of language, Volume 1 (of 2)

An essay on the origin of language, based on modern researches, and especially on the works of M. Renan

Introduction to the study of the history of language

The Internet and Languages [around the year 2000]

Duality of Voice

Della illustrazione delle lingue antiche e moderne e principalmente dell'italiana (Italian)

On the Evolution of Language

Della illustrazione delle lingue antiche e moderne e principalmente dell'italiana (Italian)