Smithsonian Report, 1895. 



Plate XXVI. 



Pyrophtr 



T L 



\ 



p/ 



Bougie. 



T 



Abc, d e f 5" 



1 III 1 ! 1 



10.— Curves of thermic, luminous, and chemical intensities in the solar spectrum. 



T, curve of thermic rays; K, curve of chemical rays; L, curve of chemical rays; L, 

 curve of luminous rays; M, position of the spectrophotometry maximum of the light 

 of Pyrophorus; m, position of the spectrophotometry maximum of the flame of 

 a candle. 



Wm 



O 



U-— Proof obtained by exposing for five minutes 

 a photographic plate covered with paper 

 lace to the light of a photogenic organ of 

 the Pyrophorus. 



12.— Photogenic elements : 



1, photogenic cell; 2, granular separation in the 

 nucleus ; 3 and 4, photogenic granulations float- 

 ing in the liquefied contents of the cell ; 5. gran- 

 ulations set at liberty by the destruction of the 

 cell wall; 6, photogenic granulation. 7, vacuo- 

 lized condition of the granulation; 8, 9, 10, 

 passage of the granulation to the radio-crystal- 

 line condition. 



Physiological Light. 



