In searching for the _Liber Eliensis_, I have had the good fortune to discover in the Cotton Library a MS. copy of the Inquisition of the jury, containing their survey for most of the hundreds in Cambridgeshire. This MS. is written on vellum in double columns and on both sides of the page. It is bound up with the _Liber Eliensis_, and begins at p. 76_a_ and ends at p. 113. It is written in a very fair but ancient character, not coeval with the Survey, but of about the time of Henry II. It was given by Mr Arthur Agard to Sir Robert Cotton, and is marked Tiberius A. VI 4. Your lordship and the Society will be of opinion that this is a discovery of importance, and what had escaped the observation of Sir H. Spelman, Mr Selden, and other antiquarians. A part of this valuable morsel of antiquity is already transcribed, and in a few weeks I hope to be able to communicate the whole of it to the Society (p. 26). Mr Webb's discovery was known to Kelham, and duly referred to by him in his _Domesday Book Illustrated_ (1788). It was also known to Sir Francis Palgrave, strong in his acquaintance with manuscript authorities, who alluded (1832) to the fact that 'fragments of the original inquisitions have been preserved',[1] and described the MS. Tib. A. VI, of which 'the first portion consists of the _Inquisitio Eliensis_, extending, as above mentioned, into five counties; it is followed by the inedited _Inquisitio_', etc.[2] It is, however, undoubtedly ignored in Ellis's _Introduction to Domesday Book_ (1833), and 'even the indefatigable Sir Thomas Duffus Hardy', writes Mr Birch,[3] 'has omitted all notice of this manuscript in his _Descriptive Catalogue of Manuscripts relating to the History of Great Britain and Ireland_, vol. ii. (1865)'. This, however, is not strictly the case, for in his notice of the Domesday MSS. he observes in a footnote: The Cottonian MS. [Tib. A. VI] has also a second and unique portion of this survey, which was not printed in the edition published by the Record Commission in 1816. It commences 'in Grantebriggesira, in Staplehouhund', and ends imperfectly 'et vicecomiti regis v. auras'. These words prove that Sir Thomas had inspected the MS., which duly begins and ends with the words here given.