At work on abstract.

Continues argument on effectiveness of dispersal. Has doubts about relationship of isolation to highness of Australian flora. Questions about survival of European plants introduced in Australia.

CD receives the Wollaston Medal of the Geological Society.

Wallace has written and is well satisfied with the joint presentation.

CD requests some facts to make case in his abstract for former glacial action in Himalayas.

CD not convinced that naturalisation of European plants abroad is strictly dependent on creation by agriculture of disturbed ground.

More than half through his chapter on geographical distribution.