(Уот, 11 
64 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Тһе most striking fact in the peptone solution (fig. 8) is the 
marked superiority of growth at 15? C. over that at either of the 
other 2 temperatures. Although the range of growth in this 
case is the same as at 25? C., Ри 2.0-8.0, there is no close compari- 
son between the weights of the felts. At 15? C. the optimum 
range is Ри 3.4-7.0 with a maximum of 679 mgs. at Pg 6.0, while 
at 25° C. there is а marked optimum at Pg 3.5, with 342 mgs. 
of growth. Тһе inferiority of 35? C. for growth of this fungus 
is evidenced both by а reduction in the weights of the mats and 
by a decrease of the range of growth to Рн 2.8-8.0. No marked 
optimum is produced, as growth varies slightly from 115 mgs. 
at Рк 4.8 to 125 mgs. at Ру 7.4, followed by a quick drop to 0 at 
Pa 8.0. In this solution in most cases the mycelial growth de- 
ereases the active acidity of the solution within the Ру range 
TABLE VII 
THE GROWTH OF POLYPORUS ADUSTUS AND THE CHANGES IN THE ACTIVE 
ACIDITY UPON BOTH THE RICHARDS' AND THE PEPTONE SOLU- 
TIONS AT DIFFERENT INITIAL Рн AND TEMPERATURES 
15°C 25° C. 35° C. : 
Рн Wt. of Рн Wt. of Рн Wt. of | 
mat in mat in mat in 
Initial | Final mgs. Initial | Final mgs. Initial | Final | mgs 
3.5 | 3.5 0 3.8 | 3.3 $31 332 0 
=| 4.0 | 3.9 46 3.9 | 4.3 | trace 3.9 | 4.2 | trace 
2| 4.4 | 4.5 49 43 | 5.3 63 42143 48 
„| 5.0 | 4.4 42 Бусы GT 81 5.1 | 4.9 
т 57 | 58 i2 | 55 | 58 80 1558 | 54 | S 
2 6.1 6.2 44 6.0 6.3 89 6.0 5.4 71 
З 6.6 6.7 43 6.5 6.4 69 6.5 6.3 64 
70 | 7.2 71 6.9 | 6.7 64 6.9 | 6.7 62 
7.5 7.5 0 7.5 7.5 0 7.6 7.6 0 
2.0 | 2.0 2.0 | 2.0 0 22 
25 | 24 2.5 | 2.5 26 
2.8 2.4 316 2.8 3.1 75 2.8 | 2.8 0 
24 80 564 25] 39 342 “ығ? 78 
21-29 129 546 4.0 | 6.5 122 40 | 621! 100 
8| 4.5 | 68 443 4.2 | 6.3 121 4.2 | 6.4 89 
oj 49 | 5.8 544 5.0 | 6.6 174 4.8 | 6.0 | 115 
8 КЕЛЕ 230 5216.2 | 119 
e| 5.5 6.8 390 5.5 6.6 109 5.5 5.6 11 
ё| 60 | 45 | 679 | 6.0 | 6.0 | ізі | 60 | 6.0 | 1% 
6.4 | 49 658 6.5 | 6.0 145 6.5 | 5.3 | 129 
7.0 | 5.0 602 7.0 | 6.0 126 TO | 7.6 121 
7.5 7.4 220 2.1 22 89 7.4 6.6 | 125 
= 8 102 
8.0 | 8.0 0 8.0 | 8.0 0 5.0 | soi © 
