Dear Sir

I do not know whether you will forgive me, a stranger to you personally though not to your works, taking the liberty of begging a favour of you.—² Namely to ask for a piece of information, which you are more likely to be able to give than anyone, though it is doubtful whether you will be able.— I am particularly anxious to know & be permitted to quote (if I find it desirable) any fact showing, that a variable species is or is not equally variable at all times & places.—³ Some facts seem to show that a species may vary far more in one area than in another; & some other, & perhaps more numerous, facts seem to indicate that a variable species is always equally variable.

With your profound knowledge of Brachiopoda, you may be able to give me examples & inform me how this is, with the species which have had a long existence or wide range.— Of course in order to judge, specimens must have been examined nearly equal in number at the two times or places.— Variability in close connexion with or caused by attachment to various substances would probably be alike at all times; so that there are many difficulties in coming to any conclusion.⁴

I formerly talked on this subject with the late E. Forbes, & more recently with M^r Woodward of the British Museum, but could get no definite light.—⁵ If you are willing to give me information on this head, I sh^d. esteem it a great kindness, which I have no right to expect, except as a fellow student in Natural History.

I beg to remain | Dear Sir | Yours faithfully | Ch. Darwin