Typescript copy of letter 25 Nov 1840 from Peter W. Dease to Dr John Richardson on the cultivation of crops in northern Canada Written from 28 Arundel Street, Strand; recipient identified from contribution by John Richardson to The New Edinburgh Philisophical Journal, Volume 30, 1841, entitled "On the Cultivation of the Cerealia in the High Latitudes of North America", pages 123-124, which contains an amended version of most of the typescript letter. [20th cent]