From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[13 October 1858]
Source of text:
RS:HS 23.243
Summary:
On the definition of an island, and an invitation to lecture about a comet.
Contributor:
John Herschel Project
On the definition of an island, and an invitation to lecture about a comet.
Discusses the use in photography of a metallic substance named Junonium.
Has just returned home and found the Photographic News and the queries regarding chemical experiments and photography. Gives details, but regrets he has not published much on it yet as he is still experimenting.