Theobald quotes also from his own correspondence. On 17th March, 1729-30, he had written to Warburton a long letter dealing with Shakespeare’s knowledge of languages and including a specimen of his proposed pamphlet against Pope. “Your most necessary caution against inconsistency, with regard to my opinion of Shakespeare’s knowledge in languages,” he there says characteristically, “shall not fail to have all its weight with me. And therefore the passages that I occasionally quote from the Classics shall not be brought as proofs that he imitated those originals, but to shew how happily he has expressed themselves upon the same topics” (Nichols, ii., pp. 564, etc.). This part of the letter is included verbatim three years afterwards in the Preface. So also is the other passage in the same letter replying to Pope on the subject of Shakespeare’s anachronisms. Theobald borrows even from his own published writings. Certain passages are reproduced from the Introduction to _Shakespeare Restored_. If Theobald could hardly acknowledge, as he said, the assistance he received in writing the Preface, he at least admitted his editorial debt to Warburton and others punctiliously and handsomely. After referring to Dr. Thirlby of Jesus College, Cambridge, and Hawley Bishop, he thus writes of his chief helper: “To these, I must add the indefatigable Zeal and Industry of my most ingenious and ever-respected Friend, the Reverend Mr. _William Warburton_ of _Newark_ upon _Trent_. This Gentleman, from the Motives of his frank and communicative Disposition, voluntarily took a considerable Part of my Trouble off my Hands; not only read over the whole Author for me, with the exactest Care; but enter’d into a long and laborious Epistolary Correspondence; to which I owe no small Part of my best Criticisms upon my Author. “The Number of Passages amended, and admirably Explained, which I have taken care to distinguish with his Name, will shew a Fineness of Spirit and Extent of Reading, beyond all the Commendations I can give them: Nor, indeed, would I any farther be thought to commend a Friend, than, in so doing, to give a Testimony of my own Gratitude.” So the preface read in 1733. But by the end of 1734 Warburton had quarrelled with Theobald, and by 1740, after a passing friendship with Sir Thomas Hanmer, had become definitely attached to the party of Pope. This is probably the reason why, in the Preface to the second edition, Theobald does not repeat the detailed statement of the assistance he had received. He wisely omits also the long and irrelevant passage of Greek conjectures, given with no other apparent reason than to parade his learning. And several passages either claimed by Warburton (_e.g._ that referring to Milton’s poems) or known to be his (_e.g._ the comparison of Addison and Shakespeare) are also cancelled.