The frequent references to the Notes of Professor Kingsley, will show the estimation in which I hold them. Perhaps I have used them too freely. My only apology is, that so far as they go, they are just what is wanted; and if I had avoided using them to a considerable extent, I must have substituted something less perfect of my own. Had they been more copious, and extended more to verbal and grammatical illustrations, these Notes never would have appeared. The editor is convinced, from his experience as a teacher, that the student of Tacitus will not master the difficulties, or appreciate the merits, of so peculiar an author, unless his peculiarities are distinctly pointed out and explained. Indeed, the student, in reading any classic author, needs, not to be carried along on the broad shoulders of an indiscriminate translator, but to be guided at every step in learning his lessons, by a judicious annotator, who will remove his difficulties, and aid his progress; who will point out to him what is worthy of attention, and guard him against the errors to which he is constantly exposed; for first impressions are lively and permanent, and the errors of the study, even though corrected in the recitation, not unfrequently leave an impression on the mind which is never effaced. Besides the aid derived from books, to which the merit of this edition, if it have any merit, will be chiefly owing, the editor takes this opportunity to acknowledge his many obligations to those professors and other literary gentlemen, who have extended to him assistance and encouragement. To Prof. H. B. Hackett, of Newton Theological Seminary, especially, he is indebted for favors, which, numerous and invaluable in themselves, as the results of a singularly zealous and successful devotion to classical learning, are doubly grateful as the tokens of a personal friendship, which began when we were members of the same class in college. The work was commenced at his suggestion, and has been carried forward with his constant advice and co-operation. His ample private library, and, through his influence, the library of the Seminary, have been placed at my disposal; and the notes passed under his eye and were improved in not a few particulars, at his suggestion, though he is in no way responsible for their remaining imperfections. I have also received counsel and encouragement in all my labors from my esteemed colleague, Prof. N. W. Fiske, whose instructions in the same department which has since been committed to my charge, first taught me to love the Greek and Latin classics. I have only to regret that his ill health and absence from the country have prevented me from deriving still greater advantages from his learning and taste. An unforeseen event has, in like manner, deprived me of the expected cooperation of Prof. Lyman Coleman, now of Nassau Hall College in N. J., in concert with whom this work was planned, and was to have been executed, and on whose ripe scholarship,