ENDOTHIA PIGMENTS 
media and thus is the only one in this group directly comparable with 
those of the other two groups. 
The curves of this group are different from those of type I in that 
more of the violet and blue are transmitted. They are separated 
from those of group II by the fact that their minimum percentage of 
transmission is in the blue. A higher percentage of wave-lengths 
shorter than 460 ix^l and a slightly higher percentage of the yellow is 
transmitted than in any of the others. The chief difference in these 
three groups is in the degree of absorption of the shorter wave-lengths 
of light by the solutions. 
|G IF lb IE D |C IB la 
r 
4/0 420 'f^O -^60 430 SOO S20 £40 S^O S80 60O 620 640 660 660 700 720 730 
Fig. 4. Curves of percentage of spectral transmission of the alkaline alcoholic 
extracts of pure cultures on rice of E. parasitica (P), E.fluens, (F), E.fiiiens mississip- 
pisensis (M) and E.singularis (S). The curves were plotted with the percentage of 
light transmitted as ordinates and wave-lengths in mm as abscissae. 
The curves derived from the percentages of spectral transmission 
of the alcoholic extracts were considerably different when these solu- 
tions were made alkaline. They group themselves into two classes 
and the curves within each class are more widely divergent than in 
the acidified solutions. As in the acidified extracts one striking dif- 
