Sends his paper [on glacial lakes, see 3450]. Falconer attacked it. Falconer thinks Himalayas confound the theory, but Hooker writes that it explains the absence of lakes there.

Their enumeration [of forms of Lythrum?] is invaluable. He will write later to explain what he is trying to prove about Lythrum through laborious crosses.

Asks for flowers of both forms of Hottonia to measure pollen and compare stigmas.