It is objected that in this Grammars stands no mention of a Latin dual. Nor does there stand there any mention of a Latin objective case, or of a Latin aorist. The Latin objective has been obscured by an unfortunate mistranslation of the Greek term αἰτιατική; but the dual did find a place in the oldest Latin Grammars we have, and the term aorist now plays a part in Latin grammatical terminology that seems to me far too great. But in the study of any language the part played by the words not expressed, but to be supplied in the mind of the reader or hearer, is very great, and I have endeavoured in the following pages to determine the origin and nature of some ellipses peculiarly Latin, that have not hitherto been adequately treated.