46 Margaret Street Cavendish Sqr
Dr Ryan <1> is absent and Mitchell the assistant is ill I have never seen you experiment & do not know
how exactly how you proceed. I have experimented a good deal but the results have not been so good as I wish as there is some fault in the mixtures would you be kind enough to come here & shew me how you work it can you come tomorrow I will meet you at what time you like.<2>
Yours very sincerely
L. L. Boscawen Ibbetson.
1. Prof John Ryan, MD (1810–1876), chemist at the Royal Polytechnic Institution, London.
2. This was at a stage in preparation of the lectures on 'Mr Fox Talbot's Calotype Process'. These were started in July when the Royal Polytechnic Institution's new rooms onto Cavendish Square were opened - they met with great success. Undoubtedly some visitors also came to see Richard Beard's Daguerreotype studio, also based there.