Abstract
It is well known that the luminous organs of insects like the fire-fly represent one of the most efficient sources of light, in that almost all the energy is concentrated in a narrow band in that part of the spectrum to which the human eye is most sensitive. In the case of the fire-fly, the spectrum photographed by Mr. Ives1 shows that this band extends from 5230 to 6550 A. FIG. 1.
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