TALBOT2210

My Dear Sir,

Having returned only yesterday from Slough, ¹ I have been prevented from returning you my best thanks for the beautiful Prism which you have been so kind as to give me.² It will enable me to complete a series of Experiments on the absorption of the heat of the spectrum ³ by transparent and other media, during which I have obtained several curious and unexpected results.

I earnestly hope that you will go on with your own optical researches. Your leisure, and powers of original investigation are capable of doing much for Science; and it would give me the greatest pleasure to receive occasionally a notice of what you have done.

I am My Dear Sir Ever Most Faithfully yrs
D Brewster

24 Sussex Place
July 1^st 1831