While lately engaged with an edition of the ‘Agricola,’ it occurred to me to enquire how far Tacitus was read, and his works copied, during the period between his lifetime and the introduction of printing. Such an enquiry is more necessary than is always realised, if one is to appreciate properly the character and importance of the manuscripts of an ancient author. One needs not only to know their dates, relationships and general merits or demerits, but also to understand what may be called their ‘background,’ that is to know how far the author in question was seriously studied and his works copied during the centuries between his own day and the Renaissance. I therefore tried to work out some account of the history of Tacitus in this respect. I have been able to do this only very briefly, but the sketch, though short, may interest some readers of our Journal, and, being more or less historical, is not alien to its proper scope. Moreover, no quite similar sketch seems to exist, either in English or, so far as I am aware, in any language.