1924) 
WOLPERT—FUNGI AND H-ION CONCENTRATION OF MEDIA 68 
growth is inhibited at 3.3 and 7.6. At 15? C. the inhibiting 
reactions are Рн 3.5 and 7.5. At none of the 3 temperatures 
is there an outstanding maximum, as there is little difference 
in the amount of growth within the range Py 4.0-7.0 at 15° C. 
“700 
fr, 
кені 
o 
8 
T 
Weight in Milligrams. 
„ 
1 
1 
‘i 
a 
1 
1 
8 
Fig.8. Polyporus adustus in peptone-nutrient solution 
and in the range 4.2-6.0 at 25? C. and 35? C. The active acidity 
at 15° C. is not materially changed by growth from the initial 
Pa; at 25? C. it is slightly decreased through the range Ру 3.9- 
6.0, and inereased at 6.5 and 6.9; while at 35? C. it is decreased ` 
slightly at 3.9 and 4.2, and increased in the other solutions from 
0.2 to 0.6 of а Ри unit. 
