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Letter from Major-General Samuel Williams Ogg to Dr George Henry Noehden, Secretary of the RAS, presenting a "specimen of a new mineral found in the Mysore Country near Belloor". A further note states "Major Genl Ogg Feb 5 1825 with an Emerald Avanturin" (avanturine). Handwritten, 1 piece, 4 sides, dated 5th February, 1825.

This series contains the Donations Register, 4 lists relating to acquisitions, and 11 pieces of correspondence.