338 
LON A. HAWKINS AND NEIL E. STEVENS 
reacted in the same general way, there were various nuances of red in 
the extracts from the different fungi. 
A study of the alcohoHc extracts from pure cultures on rice^ of 
E. parasitica, E. fluens, E. fluens mississippiensis , E. tropicalis, E. 
gyrosa, E. singularis, and E. longirostris was made with a spectro- 
^nn , 16 if ID \0 [B U 
Fig. I. Curves of percentage of spectral transmission of acidified alcoholic 
extracts from pure cultures on rice of E. parasitica (P), E. longirostris (L), and 
E. fluens mississippiensis (M). The curves were plotted with the percentage of 
light transmitted as ordinates and wave-lengths of light in ixn as abscissae. 
photometer. With this apparatus measurements were made from 
which the percentage of light of various wave-lengths transmitted by 
the solution was calculated. These data were used in plotting the 
curves of spectral transmission.'^ The alcoholic extracts of stromata of 
E. singulans from chaparral oak, E. gyrosa, from beech, and E. 
parasitica from chestnut were prepared by separating the stromata 
^ Throughout this study the fungi were grown on rice flasks prepared according 
to the method published by Shear and Stevens. Loc. cit., p. 13. 
^ This part of the work was made possible through the kindness of Mr. C. G. 
Peters, of the Bureau of Standards, who made the measurements and calculations. 
