TALBOT2865

My dear Sir

I have taken the liberty of enclosing a letter for one of my Sons, & beg that you will have the goodness to frank it to him,¹ as it is more than a Double one.

I have just sent off to M^r Taylor ² a Paper on Accidental Colours ³ in which I have proved that the Direct and accidental impression are contemporaneous, which is hostile to the Theory of these colours just published in the Ann. de Chimie by M. Plateau of Brussels. ⁴

I have observed a curious fact that a small blow on the head makes the accidental colour suddenly disappear. – I suspected that the vibrations of a powerful Gong w^d communicate a tremor to the head which would extinguish the accidental impression, but I have just tried it, and it produces no effect.

I am, My Dear Sir, Ever Most truly yrs
D Brewster

Belleville
April 10^th
1834

to
H.F. Talbot Esq^r
&c &c &c