States he has "misgivings about the definiteness of species". Believes there is some inherent tendency for plants to originate varieties. Cross-fertilisation is likely in most cases but sees difficulties with plants like Adlumia.

Important issue at stake with new flora calculations: evidence that species are only strongly marked varieties. Planning large-scale survey.

Is looking forward to returning home [from Moor Park hydropathic establishment]. News of other patients and the books she is reading. Although feeling well, cannot walk much.

Thanks for rabbit.

Are there dun-coloured ponies in Shetlands? Are they striped?

Delighted that JSH is coming to Down. Sends correct train time.

Asks JL not to call as he has a "very old friend" [J. S. Henslow] coming to visit him.

Yesterday visited poultry show at Crystal Palace.

Invites JL to dine and meet J. S. Henslow.

Tabulation of varieties goes on; very important as it shows the branching of forms. Mentions his principle of divergence.