Historical & Comparative

Introduction to the study of the history of language

A Concise Introduction to Syntactic Theory

The Philosophic Grammar of American Languages, as Set Forth by Wilhelm von Humboldt

Pennsylvania Dutch: A Dialect of South German With an Infusion of English

A Few Practical Suggestions

Account of the Romansh Language

A Minniature ov Inglish Orthoggraphy

A Philosophicall Essay for the Reunion of the Languages

Proverbs and Their Lessons

The Frontiers of Language and Nationality in Europe

The Verbalist

American Languages, and Why We Should Study Them

The International Auxiliary Language Esperanto: Grammar & Commentary

A Gothic Grammar, with selections for reading and a glossary

Palæography

On the Evolution of Language

Vocabulum; or The Rogue's Lexicon

Abbreviations and Signs

Language: Its Nature, Development and Origin

English Past and Present