<engraved address>
4, Old Square,
Lincolns Inn.
Ap. 28th 1856
H. F. Talbot Esq
Dear Sir
I entertain a strong opinion that no person has a right, without your licence, to use Gelatine mixed with Bichromate of potash applied to a surface in the dark & then to take a picture by the Camera or otherwise by the aid of light and then to wash off by water the parts not acted on by light
Yours very truly
William Carpmael