340 
LON A. HAWKINS AND NEIL E. STEVENS 
the shorter wave-lengths. There is some transmission of the violet 
rays, more of the blue, and a gradual increase in the percentage trans- 
mitted through the green and yellow to the orange. From this region 
through the red the percentage of transmission is practically the same 
for all wave lengths. The curves of this type are different from those 
of group I in that more of the violet and blue are transmitted and 
somewhat less of the yellow. 
30 
4/0'420 '^■'tO <60 -^O SOO S20 S40 S60 £80 BOO 620 &40 660 £80 700 72073O 
Fig. 3. Curves of percentage of spectral transmission of acidified alcoholic 
extracts of £. tropicalis (T) from pure culture on rice, E. parasitica (P) from stromata 
from chestnut, E. gyrosa (G), from stromata from beech, and E. singularis (S) from 
stromata from chaparral oak. The curves were plotted with the percentage of trans' 
mission of light as ordinates and the wave-lengths of light in ixix as abscissae. 
Figure 3 shows the curves derived from the percentage of light of 
the different wave-lengths transmitted by the alcholic extract of 
E. tropicalis in pure culture and also the curves for the alcoholic extracts 
of the stromata of E. singularis grown on oak, the stromata of E. 
gyrosa grown on beech and the stromata of E. parasitica grown on 
chestnut. The curve obtained for the extract from E. tropicalis is 
typical of the group. This fungus was grown on artificial culture 
