...by the purely calorific rays outside of the visible spectrum, though far more intense ; and thirdly, that the heat radiated from obscurely hot iron abounds...analogous to those of the region of the spectrum above described. The author then describes the photographic properties he has discovered to belong to mercury,...

...by the purely calorific rays outside of the visible spectrum, though far more intense ; and thirdly, that the heat radiated from obscurely hot iron abounds especially in rays analogous to th'tse of the region of the spectrum above described. The author then describes the photographic properties...

...CONCLUSIONS TO BE DRAWN. 233 of these rays, not their light, which operates the change ; 2dly. That this heat possesses a peculiar chemical quality which...positive, that is, the lights and shadows are the game as in nature, bat by the application of heat, the color is changed from blue to brown, from positive...

...by the purely calorific rays outside of the risible spectrum, though far more intense ; and, 3rdly. That the heat radiated from obscurely hot iron abounds...as in nature, but, by the application of heat, the colour is changed from blue to brown, from positive to negative ; even by keeping in darkness the blue...

...by the purely calorific rays outside of the visible spectrum, though far more intense; and, 3rdly, that the heat radiated from obscurely hot iron abounds...those of the region of the spectrum above indicated." I have proved this fact with a great number of preparations of cobalt, nickel, bismuth, platinum, and...

...by the purely calorific rays outside of the visible spectrum, though far more intense ; and, Srdly, that the heat radiated from obscurely hot iron abounds...those of the region of the spectrum above indicated." Sir John Herschel then proceeds to show that whatever be the state of the iron in the double salts...

...— 1st. That it is the heat of these rays, not their light, which operates the change ; 2dly. That this heat possesses a peculiar chemical quality which...white ground and positive, that is, the lights and sl.adows are the same as in nature, but by the application of heat, the color is changed from blue...

...by the purely calorific rays outside of the visible spectrum, though far more intense ; and, 3rdly, that the heat radiated from obscurely hot iron abounds...those of the region of the spectrum above indicated." Sir John Herschel then proceeds to show that whatever be the state of the iron in the double salts...

...by the purely calorific rays outside of the visible spectrum, though far more intense ; and, Srdly, that the heat radiated from obscurely hot iron abounds...especially in rays analogous to those of the region of fihe spectrum above indicated." Sir John Herschel then proceeds to sho'w that whatever he the state...

...by the purely calorific rays outside of the visible spectrum, though far more intense ; and, 3rdly, that the heat radiated from obscurely hot iron abounds...those of the region of the spectrum above indicated." Sir John Herschel then proceeds to show that whatever be the state of the iron in the double salts...