To the President and Council of the Geological Society of London1 24 March 1840
12 Upper Gower St
March 24th. 1840
It is with much regret, that I feel myself compelled, from the state of my health to resign the office of one of your secretaries. The only apology I can offer, for not having taken this step before the day of the Anniversary,2 which probably would have been more convenient, is, that I did not at that time anticipate its necessity, and the regret I felt at giving up so very honourable a post led me to defer it, as long as I was able.— Should there be any delay in filling my place, I shall be happy to attend in it, as often as my health permits
I have the honour to remain | Gentlemen | Your obedient servant | Charles Darwin3 To the President and Council | of the Geological Society.
Regrets that state of his health forces him to resign as one of the Secretaries of the Society.