Whitney, Language and the Study of Language.
Hovelacque and Vinson, The Science of Language.
Pictet, Origines Indo-Européennes.
Steinthal, Charakteristik der hauptsachlichsten Typen des Sprachbaues.
Civilisation:—
Maine, Ancient Law.
Lubbock, Origin of Civilisation.
Bagehot, Physics and Politics.
Freeman, Comparative Politics; Historical Essays.
Draper, Intellectual Development of Europe.