Linguistics

On the Study of Words

The Comic English Grammar: A New And Facetious Introduction To The English Tongue

Division of Words

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

Lectures on Language, as Particularly Connected with English Grammar

Palæography

The ethics of rhetoric

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

Esperanto: Hearings before the Committee on Education

American Languages, and Why We Should Study Them

The International Auxiliary Language Esperanto: Grammar & Commentary

Ironman language requirements

Cratylus

Vocabulum; or The Rogue's Lexicon

Parts of Speech

Account of the Romansh Language