Thanks FD for seeds of Canna.

Still thinks it would be worth FD’s while looking at the fertilisation of Lotus; does not think Frank Darwin has exaggerated the novelty of the contrivance.

Thanks CD for his help and encouragement in his series of experiments [to test Pangenesis].

Thanks AS for his kindness towards himself and his family. Looks back with great satisfaction to his last visit ("as it will probably prove") to Cambridge.

Continues to explain matters in perturbation theory. Stresses need for careful observations in solar eclipses. Doubts the existence of the hypothetical intermercurial planet Vulcan.