Linguistics

Compound Words

Division of Words

On English Homophones

Geographical etymology: a dictionary of place-names giving their derivations

The Principles of Language-Study

An essay on the origin of language

The ethics of rhetoric

A Concise Introduction to Syntactic Theory

Introduction to the study of the history of language

Lectures on Language, as Particularly Connected with English Grammar

Palæography

Lectures on the Science of Language

The ethics of rhetoric

Romano Lavo-Lil: Word Book of the Romany; Or, English Gypsy Language

Esperanto: Hearings before the Committee on Education

International Language and Science

American Languages, and Why We Should Study Them

The International Auxiliary Language Esperanto: Grammar & Commentary

On the Evolution of Language

Ironman language requirements