John Constable: Toward a Complete Chronology. - Reed College

1821 Jan "Completely engrossed in painting the third of his large
pictures, The Hay Wain. " (JCC II, p. 265)
1821 Feb 1 Letter (mistakenly dated Janry. 1st by Fisher, postmarked
2nd February) from John Fisher in Salisbury to J.C. in London.
(JCC VI, pp. 60-61)
1821 Feb 14 Letter from John Fisher in Osmington to J.C.: "And how
thrives the 'hay wain'? . . . . As soon as the Spring arrives, I
will make a correct sketch of our ferry house at Portland &
send it you." (JCC VI, pp. 61-62)
1821 Feb 25 Letter from Abram at Flatford Mill to J.C. in Hampstead: "I
shall take the opportunity of sending you John Dunthorne's
outlines of a scrave or harvest waggon. I hope it will answer
the desired end." This "seems to show that the principal
feature had still to be added to The Hay Wain." (JCC I, p.
193)
1821 late Feb Letter (probably written late February) from J.C. in London to
John Fisher: "My picture is getting on. . . . Do not forget to
send me the drawing of the ferry house—it is a 'blessed spot'
but that is its value." (JCC VI, pp. 62-63; see also JCC IV, p.
153)
1821 early March Letter from J.C. in London to John Fisher, indicating his
picture is getting on. (JCC II, p. 265)
1821 March 6 Letter from John Fisher in Salisbury to J.C. in London: "This
will bring me to town in May: when I expect to see the Hay
wain in a good light. The first week in June I go my visitation.
Will you accompany me free of expense. I shall take Oxford in
my way." (JCC VI, p. 64)
1821 March 24 Letter from Henry Greswolde Lewis at Ham House to J.C. in
London. (JCC IV, p. 65)
1821 March 29 Birth of Charles Golding to J.C. and Maria. (JCC II, p. 266)
1821 To dine with Sir George Beaumont in London. (JCC IV, p.
end of March 226; see also JC: FDC, p. 145)