Sending Smith Weihe's "Rubi Germanici" for inspection, at suggestion of Edward Forster, and specimens of the 'Rubus' of this region. List of specimens with observations, numbered, dated 6 December 1823, including: 'R. leucostachys', 'R. fruticasus', 'R. rhamnifolius', 'R. nitidus', 'R. suberectus', 'R. corylifolius', 'R. affinis', 'R. glandulosus', 'R. caesius', and 'R. idaeus'.

Sends specimens of willows ['Salix'] in leaf he previously sent in flower. Recommends forgetting names quoted from Mertens, who named them in his garden without reference to specimens or books, particularly unsure on 'S. tetrapla'. Forster's opinion of 'S. wulfeniana' derived from foreign specimen.