I have been making some calculations about varieties, etc., and talking yesterday with Lubbock, he has pointed out to me the grossest blunder which I have made in principle, and which entails two or three weeks' lost work; and I am at a dead-lock till I have these books to go over again, and see what the result of calculation on the right principle is. I am the most miserable, bemuddled, stupid dog in all England, and am ready to cry with vexation at my blindness and presumption.
Ever yours, most miserably, C. DARWIN.
CHARLES DARWIN TO JOHN LUBBOCK. Down, [July] 14th [1857].
My dear Lubbock,
You have done me the greatest possible service in helping me to clarify my brains. If I am as muzzy on all subjects as I am on proportion and chance,—what a book I shall produce!
I have divided the New Zealand Flora as you suggested, there are 329 species in genera of 4 and upwards, and 323 in genera of 3 and less.
The 339 species have 51 species presenting one or more varieties. The 323 species have only 37. Proportionately (339: 323:: 51: 48.5) they ought to have had 48 1/2 species presenting vars. So that the case goes as I want it, but not strong enough, without it be general, for me to have much confidence in. I am quite convinced yours is the right way; I had thought of it, but should never have done it had it not been for my most fortunate conversation with you.
Un quite shocked to find how easily I am muddled, for I had before thought over the subject much, and concluded my way was fair. It is dreadfully erroneous.
What a disgraceful blunder you have saved me from. I heartily thank you.
Ever yours, C. DARWIN.