46 



THE NATURE OF ANIMAL LIGHT 



039fi 



Fig. 9. — Spectra of various luminous animals (after 

 McDermott). 1. Portion of the visible solar (grating) spec- 

 trum showing Fraunhofer lines. 2. Pyrophorus noctilucus 

 (Langley and Very.) 3. Lampyris noctiluca (Conroy). 4. 

 Photinus pyralis (Ives and Coblentz). 5. Photinus con- 

 eanguineus (Coblentz). 6. Photuris pennsyhanica (Co- 

 blentz). 7. Phengodes laticollia (McDermott). 8. Bac- 

 terium phosphoreum, B. phosphorescens or Bacillus photo- 

 genus (Moliflh). 9. Photobacterium indicum (Barnard). 

 10. Mycelium X (Molish). 11. Luminous bacteria (Forster). 

 12. Agaricus sp.l (Ludwig). 13. Fluorescent spectrum of 

 luciferesceine of Photinus pyralis (Coblentz). Only the 

 extreme ends of the bands are shown and no attempt is 

 made to indicate the relative density of different portions 

 of the spectra. 



