As far as we know, Turner first experimented with oil sketching
from nature in Kent in 1799; his friend, Joseph Farington, recorded in his diary that he had been there 'painting from Beech Trees'. His tree studies, of which two are shown here, were made at Knockholt and in Chevening Park nearby. In them, Turner experimented with new combinations of media: mixing oil and watercolour on paper first prepared
with a sizing solution.