TALBOT9214

13 Great Stuart Street ¹ Edinburgh

April 5^th 1867

My Dear Sir

I am very much obliged to You for the indication of M^r Clerk Maxwell’s 2 papers ² – I have looked at both of them – I made a good many exp^ts on the subject in 1833, ³ starting from the Known fact that blue & yellow do not make green when successively presented to the eye on a rotating disk.

When sunlight is reflected from yellow paper upon blue paper, it makes green but when the image of the blue is thrown on the Yellow by a double refracting prism, it does not make green – There are various other anomalies –

Yours truly

H. F. Talbot

[on verso, in J D Forbes’s hand:]
M^r Fox Talbot
April 1867
Clerk Maxwells colour Exp^ts