every century since the time of Gutenberg. Henry Estienne’s essay may, I think, be considered partly as an affectation and partly as a piece of self-conceit. The second of these monographs presents a description of the status of his Press, together with an _Index librorum_ or classified catalogue of his publications. It forms in fact the chief authority for the history of his business. A considerable portion of the _Epistola_ is devoted to a description of the purpose and character of the great _Thesaurus Linguae Graecae_, then in course of production. Henry takes pains to explain that the plan and inception of the _Thesaurus_ were due to his father Robert, who had in fact, before his death, collected a large amount of material for the great etymological and lexicographical undertaking, which may be considered, therefore, as the work of two generations of scholarly publishers. Greswell is in accord with Maittaire in describing the work as an “admirable and unrivalled monument of ardent zeal for the advancement of learning, and as an example of unwearied diligence and of colossal erudition.”[31] The remainder of the _Epistola_ is devoted to a recital of the injuries done to the authors of classical antiquity by ignorant and careless editors and by credulous printers, ready to accept on the authority of such editors new readings and unfounded “emendations” in the text. Henry announces that he has in preparation a treatise to be entitled _De Origine Mendorum in authoribus Graecis et Latinis_, but Greswell can find no evidence that this was ever published. The _Epistola_ closes with a humorous complaint of the trivial and harassing interruptions to which a scholarly publisher is exposed at the Frankfort Fair and elsewhere, on the part of applicants for information concerning his publishing undertakings and plans. The complaint is printed in Latin iambics. I quote some of the lines as Englished by Greswell. It will be noted that the _Index librorum_ or catalogue of Estienne had been printed for the purpose of answering such inquiries in print. Aldus had, it may be remembered, been driven to a similar course in 1498, but catalogues were still the exception rather than the rule.