carnegie institution of washington publication spkctrai energy curves of eight emitted by various species 19 the quotdensitiesquot i e the amount of light absorbed were than plotted to a scale as indicated in fig 7 in this illustration the heavy lines xx x give the effect of the light of photuris pennsylvanica of photinus pyralis 0 and of the carbon glow lamp 4quot 8quot etc as recorded on the large spectrograph negatives in the same manner fig 8 shows several density curves of photuris pennsylvanica pjwtinns consanguineus rft6jj.jpg from xaaax View Photo