Extremely sorry for trouble he has given about his signature.

One child dangerously ill with diphtheria, another with much fever.

Asks JP to remember him if anything occurs to him "in regard to inheritance at corresponding or rather earlier ages". Sends JP a few examples for his "Chronometry of life". CD is sure he often met with striking facts but he disregarded them. "Deviations alone would have struck me."

Effects of different climates on breeding periods.