Notes on a possible Bentham manuscript: A mystery unresolved

In the Works and Correspondence of David Ricardo (Volume X) Piero Sraffa noted that the Mill-Ricardo case of the Ricardo Papers deposited at Cambridge contained 'a paper probably in Bentham's hand-writing on the effects on profits of cultivating successive qualities of land'. In 1978 I made a search of the Ricardo Papers and no such document was to be found. This note reports the discovery in Trinity College Library - and provides a transcription - of a document that may be the elusive item, though it is in James Mill's hand.