Thanks BDW for pamphlets [by S. H. Scudder and J. D. Caton].
His information about Cicada is of extraordinary interest. Discusses stridulation organs which certainly sometimes differ in the sexes. CD would be curious to know if "dumb" Cicada can breed.
Down. | Bromley. | Kent. S.E.
Sep 21 1868
My dear Sir
I am very sorry that my book has never reached you, & so is Mr Murray, & he has proved his sorrow by sending off at his own cost by post this day another copy.
I have much to thank you for: I have been glad to see D
Judge Caton's pamphlet is really admirable, & I have found in it much useful for my work.
Pray thank M
I am particularly obliged for your information about the stridulating organs; these certainly sometimes differ in the two sexes, but how far this is general I am unable to say.
Your investigation about the Cicadas possesses extraordinary interest & the map will be a curiosity. How odd it is that individuals do not migrate from one area into another, & thus cause apparent confusion in the periods.
I see that Scudder states that the Orthoptera stridulate
differently by night & day; may not the ``forced'' Cicadas
be dumb from coming out when the average temperature is too
low; it w
With most sincere thanks for all your kindness— Believe me yours very truly | Ch. Darwin
- f1 6382.f1See letter to John Murray, 16 September , and letter from John Murray, 18 September .
- f2 6382.f2CD refers to a work by Samuel Hubbard Scudder on the stridulating organs of Orthoptera (Scudder 1867; see letter from B. D. Walsh, 29 August 1868 and n. 14). CD used information from Scudder's paper in Descent 1: 353, 356, and 2: 331; CD mistakenly cited it as being from the April 1868 issue of the periodical, rather than from the October 1867 number (see Scudder 1867).
- f3 6382.f3For CD's use of Caton 1868, sent to him by Walsh, see the letter to J. D. Caton, 18 September 1868 and nn. 2--5.
- f4 6382.f4For Charles Valentine Riley's article on peach trees, see the enclosure to the letter from B. D. Walsh, 29 August 1868; Walsh had also asked whether CD could send Riley both his photograph and John Obadiah Westwood's.
- f5 6382.f5See letter from B. D. Walsh, 29 August 1868. For more on CD's recent investigations into stridulating organs, see the letter to A. R. Wallace, 16 September  and nn. 2 and 3.
- f6 6382.f6See letter from B. D. Walsh, 29 August 1868.
- f7 6382.f7Scudder wrote that the day and night songs were different only in some species; see Scudder 1867, pp. 309--10, for the differing songs. On the `forced' cicadas, see the letter from B. D. Walsh, 29 August 1868.