Examined the Cytisus and forwarded to Caspary. The C. adami case "gets more and more perplexing", asks for report if Cytisus purpureus-elongatus produces any pods.
Down. | Bromley. | Kent. S.E.
My dear Sir
I thank you most cordially for the Cytisus, after examining which I forwarded to Prof.
Caspary at Kœnigsberg; so you have killed two birds with one
act of kindness. The C. adami case gets more & more perplexing. I wish
your experiments with the buds of the Negundo had succeeded.— If you will not think me an insufferable bore, I wish you
With many thanks | My dear Sir | Yours very sincerely | Ch. Darwin
- f1 5115.f1The year is established by the relationship between this letter and the letter from Thomas Rivers, 6 June 1866.
- f2 5115.f2See letter from Thomas Rivers, 6 June 1866. CD was interested in Robert Caspary's research on Cytisus adami (now +Laburnocytisus adami). See letter to Thomas Rivers, 27 April  and n. 4.
- f3 5115.f3See letter from Thomas Rivers, 6 June 1866 and n. 3. CD cited Rivers on the transmission of colour from the bud of a purple-leaved hazel to a rootstock of the common green-leaved hazel in Variation 1: 395.
- f4 5115.f4See letter from Thomas Rivers, 6 June 1866 and n. 2. In Variation 1: 388--90, CD discussed the viability of ovules and pollen in Cytisus hybrids, and reported a case of a sterile hybrid of Cytisus purpureus and C. elongatus that had been described by Alexander Carl Heinrich Braun (see Braun 1853, p. xxiii).