1924] 
WOLPERT—FUNGI AND H-ION CONCENTRATION OF MEDIA 61 
as compared to Py 4.9 and а mat of 74 mgs. at 25? C. and 4.3 
and a mat of 56 mgs. at 15? C. Тһе optimal Pg for the two higher 
temperatures is less acid and not as sharply defined as at 15? C. 
Weight in Milligrams. 
- 
, 
et* 
E 
Fig.6. Armillari зе 
In the peptone solution (fig. 6) growth at 15° C. is noticeably 
less than at either 25° C. or 35° C., while at these two tempera- 
tures the curves are much alike. On the other hand, the growth- 
zones for 15° C. and 35° C. are practically identical, being Pg 
2.5-7.5 in the first case and 2,5-7.4 in the second, as compared 
ќо 2.0-7.8 at 25° C. The optimal Py, 3.4 with a mat weighing 
178 mgs. at 15°C.,3.8 with a mat weighing 301 mgs. at 25°C.,and 
3.9 with a mat weighing 293 mgs. at 35° C., are comparatively 
