J. B. Greenough 
Allen and Greenough’s New Latin Grammar for Schools and Colleges [PDF ebook] 
Founded on Comparative Grammar

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The editors have been fortunate in securing the advice and assistance of Professor E. S. Sheldon, of Harvard University, for the first ten pages, dealing with phonetics and phonology. They are equally indebted to Professor E. P. Morris, of Yale Univer sity, who has had the kindness to revise the notes on historical and comparative syntax. Particular acknowledgment is also due to Mr. M. Grant Daniell, who has cooperated in the revision throughout, and whose accurate scholarship and long experience as a teacher have been of the greatest service at every point.