The transcript of Letter No. 3899, has been in hand for some time, and will be sent you in the course of a day or two. It has been troublesome work owing to the ink being very faded, as well as the writing and spelling being of course very antiquated. I am afraid it will cost you about £1, as I was obliged to employ a first rate copyist.
I am, yours truly,
Asst. Sec. R.S. [Assistant Secretary, Royal Society]'.