Copy letter from C R [Charles Richard] Weld, the Assistant Secretary of the Royal Society; to Mr Lyall Informs that the property held by My Lyall has been revalued by John Harris, who has suggested the land be improved through draining. Informs the current valuation us at £110. 3. 4., and asks if Lyall wants to continue being a tenant to the Royal Society. With the 5% annual interest in the draining of the land, Higgins estimates the costs to be £143. 30 April 1850