[headed notepaper:]
10. Pall. Mall. London.
Apl 5th 1852
To
H F Talbot Esqr
Sir –
I am requested by Mr Henneman to forward you 4oz of the Hypo Iodide of Silver – and which I think you will find the best preparation for taking portraits on glass – the time varies from 2 to 10 seconds but the temperature of the room in which the processes are conducted should not be less than 70º F.
Yours respectfully
Richd W Thomas