He steadily investigated the muniments of all the colleges, and in 1667 made his first journey to London, where he visited Dugdale, who introduced him into the Cottonian library, and Prynne showed him the same civility for the Tower records.
Three of the most precious collections of medieval manuscripts still in existence were then begun by Thomas Bodley (the Bodleian at Oxford), Archbishop Matthew Parker (Corpus Christi at Cambridge), and Robert Cotton (the Cottonian collection of the British Museum).
Two large rolls containing the desired information, which he presented to the queen, are still preserved in the Cottonian Library.
In a volume in the Cottonian collection now at the British Museum.
It was based mainly on the MS. called G above, and is the chief source of our knowledge of that MS. which perished, all but three leaves, in the Cottonian fire of 1723.
Papers read at their meetings are preserved in the Cottonian library and were printed by Thomas Hearne in 1720 under the title A Collection of Curious Discourses, a second edition appearing in 1771.
Among the Cottonian MSS.
He now had a lodging in the Heralds' Office, and spent much of his time in London examining the records in the Tower and the Cottonian and other collections of MSS.
Of Ancren Riwle in the Cottonian collection in the British Museum, numbered Nero A xiv., Titus D xviii., and Cleopatra C vi.