It is especially Johnson's scholarship that must have made his society full of instruction for Shakespeare. Ben's acquirements were encyclopædic, and his acquaintance with the authors of antiquity was singularly complete and accurate. It has often been remarked that he was not content with an exhaustive knowledge of the leading writers of Greece and Rome. He knows not only the great historians, poets, and orators, such as Tacitus and Sallust, Horace, Virgil, Ovid, and Cicero, but sophists, grammarians, and scholiasts, men like Athenæus, Libanius, Philostratus, Strabo, Photius. He is familiar with fragments of Æolic lyrists and Roman epic poets, of Greek tragedies and Roman inscriptions; and, what is still more remarkable, he manages to make use of all his knowledge. Whatever in the ancients he found beautiful or profound or stimulating, that he wove into his work. Dryden says of him in his "Essay of Dramatic Poesy":-- "The greatest man of the last age (Ben Jonson) was willing to give place to the ancients in all things: he was not only a professed imitator of Horace, but a learned plagiary of all the others; you track him everywhere in their snow. If Horace, Lucan, Petronius Arbiter, Seneca, and Juvenal had their own from him, there are few serious thoughts which are new in him.... But he has done his robberies so openly, that one may see he fears not to be taxed by any law. He invades authors like a monarch; and what would be theft in other poets is only victory in him." Certain it is that an uncommon learning and an extraordinary memory supplied him with an immense store of small touches, poetical and rhetorical details, which he could not refrain from incorporating in his plays. Yet his mass of learning was not of a merely verbal or rhetorical nature; he knew things as well as words. Whatever subject he treats of, be it alchemy, or witchcraft, or cosmetics in the time of Tiberius, he handles it with competence and has its whole literature at his fingers' ends. He thus becomes universal like Shakespeare, but in a different way. Shakespeare knows, firstly, all that cannot be learnt from books, and in the second place, whatever can be gleaned by genius from a casual utterance, an intelligent hint, a conversation with a man of high acquirements. Besides this, he knows the literature which was at that time within the reach of a quick-witted and studious man without special scholarship. Ben Jonson, on the other hand, is a scholar by profession. He has learnt from books all that the books of his day--for the most part, of course, the not too numerous survivals of the classic literatures--could teach a man who made scholarship his glory. He not only possesses knowledge, but he knows whence he has acquired it; he can cite his authorities by chapter and paragraph, and he sometimes garnishes his plays with so many learned references that they bristle with notes like an academic thesis.