John Herschel
[Mathematician, astronomer, and discoverer that hyposulphite of soda fixes photographs, b. 1792, Slough, Buckinghamshire, England, d. 1871, Hawkhurst, Kent, England.]

 It is hardly too much to call [daguerreotypes] miraculous. Certainly they surpass anything I could have conceived as within the bounds of reasonable expectation... I cannot commend you better than to come and see. Excuse this ebullition! (To William Henry Fox Talbot, 1839.)