Dear Sir
Our mutual friend Dr. Falconer has told me that I might use his name as an apology for troubling you.—3 I am very much interested on the subject of the variation of our domestic animals; & I have seen in several works, statements on the degeneracy of dogs in India & that Bull-Dogs, for instance, not only lost courage, but actually changed in form.4 I never could quite believe this, but Dr. Falconer says he feels pretty sure that it is true.5 He thinks that you could give me reliable information on this head; & it would be a very great kindness, if you could.—6
The danger of a cross seems the obvious source of error. If you would be so kind, when at leisure, to answer this note, I should feel extremely much obliged.— I have sometimes gone so far as to doubt whether climate has any direct influence even on colour.—
Pray believe me | Dear Sir | Your’s faithfully & obliged | Charles Darwin
Please cite as “DCP-LETT-1906,” in Ɛpsilon: The Charles Darwin Collection accessed on