28 November 1840
Dear Sir,
I expect in a day or two from Mr Davidson 1 a full account of his Process, and I shall let you know the time in which the Picture is formed in the Camera.
I have intimated my intention of giving a public lecture in the College here 2 on the Principles & Methods of Photogenic Drawing and the Daguerrotype: If you would send me one of your Portraits 3 to exhibit, I should return it to you immediately.
I am Dear Sir Ever Most Truly yrs
D Brewster
St. Andrews
Novr 28th 1840
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