To Fritz Müller   17 August 1868

My dear Sir

I have received your letter of June 17^th & am much obliged for it. I am glad that you have sent the additional discussion on the primordial form of insects & have this day forwarded it to M^r Dallas, together with your remarks on the title. I feel sure however that Murray w^d object to so unusual a word as Carcinology.¹ I have not heard lately what progress M^r Dallas has made. With respect to profits I fear it is a case of cooking the hare before it is caught, but I have no claim whatever to them.² Very many thanks for the dried dimorphic flowers; they seem to offer a grand case, & whenever I come to this subject again I will see whether Hooker can name the genus.³ In a former letter you told me that you suspected that some water plant (name forgotten) was trimorphic; I sh^d like some time to hear about this.⁴ Also hereafter about Escholzia.⁵ Your case of the Marantaceous plant seems extremely curious & I hope you will investigate it & write a little paper on the subject.⁶ Thanks also for the many & curious facts about the coloured & attached seeds; such cases seem quite common with you.

I am astonished about the Wulffia; what a puzzle it is how a pappus c^d have been converted into an attractive berry; that is if the calyx is the part which has been modified. ⁷

My health has been very indifferent for the last 2 months & I have had to stop my work on sexual selection; & have observed nothing & done nothing of late. I am writing this by the sea side, but shall return home in a few days & then I must try if I can do any thing.⁸

With cordial thanks for your letter which like all the others has interested me much I remain my dear Sir | yours very sincerely | Charles Darwin

If ever you form any opinion whether against or for Pangenesis, pray let me hear, as I value greatly your judgment.—⁹