Thanks JDH for agreeing to observe coats of asses and mules in Middle East.
Asks for observations on vigour of plants as JDH ascends mountains.
Ad hominem article in Athenæum [review of John Tyndall, Glaciers of the Alps, 1 Sept 1860, pp. 280–2].
Reports extensive experiments on Drosera.
Observations on orchid anatomy.