Dear Sir
I hope that you will excuse the liberty I take in writing to you, & requesting a favour. In the Annals of Nat Hist, vol. 15, p. 396 you remark “The variations of forms in the maxillæ are of no value amongst the Phalangidæ, in affording generic or specific characters, as with the true spiders.—”2 Am I to understand from the latter part of sentence that with the individuals of the same undoubted species the maxillæ vary in form? Is not this a very surprising fact? Would you have the great kindness, if the fact be so, to give me some details on the amount & kind of variation, & in what species. And further would you permit me to quote any such facts on your authority?3
With many apologies for troubling you, I beg to remain | Dear Sir | Yours very faithfully | Charles Darwin.
[ of a page excised]
Please cite as “DCP-LETT-2664A,” in Ɛpsilon: The Charles Darwin Collection accessed on