(Vor. 11 
ANNALS OF THE MISSOURI BOTANICAL GARDEN 
62 
close to the acid limit for growth. In all cases, after passing 
the optimum, the growth curves gradually and irregularly decrease 
as the solutions become less acid and fall rapidly to 0 after 
passing the neutral point. 
It is noticeable that both the ranges of growth and the amount 
of growth expressed in mgs. are greater in the peptone solution 
= >N 
bd Pd 
т „ \ 
w qm mt \ 
= Pd < Жж 
и ~ 
> E f ^N 
4 
і 
-50 14 = 
єч : E 2 ee 
s) | ~" ES -4 
aeg * і ы 
2-і е 
; : Т. 
Ex 0 "ебе n 
e A 
4 = <- an М 
ae " 
г 55° 
4 Е" 
|| ! | | | |) | || 
+ 5 6 7 
Fig.7. Polyporus adustus in Richards’ solution. 
than at the corresponding temperatures in the Richards' solution. 
In both cases growth at 15? C. is less than that at either 25^ C. 
or 35? C. Of these 2 temperatures, although the differences are 
not pronounced, 25? C. is better as indicated both by increased | 
growth and by wider P, limits 
Polyporus adustus (table vn) in the Richards' solution (fig. 
7) grows best at 25? C. and least at 15° С. At 25? C. growth is 
inhibited at Ри 3.3 and 7.5, almost the same as at 35° C. where | 
