To Fritz Müller 8 September 1
Down. | Beckenham | Kent. S.E.
My dear Sir
I write now to ask you to observe the Papilio or Peridromia feronia, which I believe inhabits St. Catharina— see my Journal of Travels p. 33— I want to know whether both sexes equally make the ticking noise.— I shd. think the structure at base of wings wd. be worth your investigation.—2
I received your letter of June 15th & am glad to hear the confirmation of the dimorphic case of Faramea.—3
The plants of Eschotzia from your seed (N.B. Asa Gray has been here, & says your plant & mine are both strictly E. Californica)4 have, when artificially & spontaneously self-fertilised, produced pods! but they are very small (& few in number) compared with the crossed pods.5 They are not yet ripe, so I know nothing about seed.— I shall be very curious to hear how my plants behave with you.—6
I sent your account of Begonia to Hooker, who was much struck by it.7
I have cases with Reseda odorata as capricious in respect to fertilisation as yours of Cypella(?).—8
Claparède has published what appears a splendid memoir on the Acarids; & he applies an argument like yours about the breathing organ of Crustaceans in my favour.—9
I will send in a few days a copy of a small paper on Orchids.10
In Haste pray believe me | Yours ever sincerely | Ch Darwin
Wants observations on a Papilio to see whether ticking noise is confined to one sex.
Experiments on self-sterility.
Will send copy of his orchid paper ["Fertilisation of orchids", Collected papers 2: 138–56].
Eschscholzia when self-fertilised, produced pods.
- Letter no.
- Charles Robert Darwin
- Johann Friedrich Theodor (Fritz) Müller
- Sent from
- Source of text
- British Library (Loan 10:30) (by kind permission of English Heritage)
- Physical description