Thanks for Cross and self-fertilisation.

His work on poppy varieties confirms increased vigour with crossing.

JS is carrying out opium poppy experiments CD suggested. He is busy with opium duties. Observing many fields of poppies, day and night, JS finds them remarkably free of insects. Believes they are wind-pollinated and that varieties have prepotent pollen since he has shown they do not cross naturally.

Plans to send a paper on Cyclosis to Linnean Society.

Thanks OZ for a "magnificent Album".

On Beagle voyage CD believed in permanence of species. Had occasional vague doubts. In autumn of 1836 saw how many facts indicated common descent of species. In 1837 opened notebook to record facts.