SPECTRAL ENERGY CURVES OF LIGHT EMITTED BY VARIOUS SPECIES. 25 
ing the color values which correspond with these maxima. A mere glance 
at the photographic curves of the light of the same insects, obtained with 
T T T 
19 : : i 
Emissivity 
5 L 
we 4 6 8 -60 2 aL 
Fic. 11.—Spectral energy curves of firefly and glow-worm. 
different apparatus, as shown in Figs. 7 and 8, should suffice to demonstrate 
this point. The emission maxima of the various insects studied are shown 
in Table 3. 
TABLE 3. 
Animal. | Maximum of emission. 
| -_ 
Pyrophorus noctilucus....................... . 0,538 to0.540 
Photuris pennsylvanica...................... | +552 
Glow-worm (larva of Photuris pennsylvanica) . 552 
Photinus: pyralisy ioc ccsud cog aaicingee ase eee da 507 
Photinus consanguineus...................... | 578 
Photinus scintillans.................00.00000- | 2 ae to 0.580 
