The Origin of Thought and Speech

The Internet and Languages [around the year 2000]

On the Nature of Thought Or, The act of thinking and its connexion with a perspicuous sentence

Lectures on the Science of Language

How We Think

Essays in Experimental Logic

Thought-Culture; Or, Practical Mental Training

Della illustrazione delle lingue antiche e moderne e principalmente dell'italiana procurata nel secolo XVIII. dagli Italiani - Parte II

Opuscula: Essays chiefly Philological and Ethnographical

Thinking as a Science

Introduction to the study of the history of language

Primitive culture, vol. 2 (of 2)