TALBOT2741

43 Piccadilly
31^st Jany 1874

Dear Sir

I have undertaken to give a Friday evening lecture at the Royal Institution – the 20^th of Feby ¹– Will you take the trouble to let me know whether you ever lectured there on the calotype process – for I have an impression that this was so – I was working the Calotype process ² in 1844, and believe that some of my information was derived from the lecture I believe I heard.

Kindly tell me also the date of the publication of your Calotype process

I am Dear Sir Yours faithfully
Vernon Heath

W. H. Fox Talbot Esqre F R S
Lacock Abbey
Near Chippenham