Duality of Voice

Language: Its Nature, Development and Origin

On the Evolution of Language First Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1879-80, Government Printing Office, Washington, 1881, pages 1-16

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

Psycho Vox; or, The Emerson System of Voice Culture

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

The Internet and Languages [around the year 2000]

Introduction to the study of the history of language

Primitive culture, vol. 1 (of 2)

The Voice and Spiritual Education

Opuscula: Essays chiefly Philological and Ethnographical

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