Allen and Jolivette—Light Reactions of Piloholus. 559 
sporanges is 0.6 centimeter below the median line. At 35 cen¬ 
timeters it is 0.3 centimeter below; at 40 centimeters, 0.4 cen¬ 
timeter below; at 50 centimeters, 0.5 centimeter below; at 
65 centimeters, 1.3 centimeters below; at 80 centimeters, 1.2 
centimeters below’; at 90 centimeters 1.1 centimeters below; 
at 100 centimeters, 0.7 centimeter below ; and at 110 centi¬ 
meters, 0.9 centimeter below. The data are given in complete 
form in Table VI. The center of distribution varies from 0.3 
centimeter to 1.3 centimeters below the median line; in no case 
is it above. It thus appears that the sporangiophores are 
pointed directly at a source of light, whatever the distance of 
the latter. 
i 
Table VI .—Glass 25cm. from Culture. 
Culture at 
25 cm. 
35 cm. 
40 cm. 
50 cm. 
65 cm. 
80 cm. 
90 cm. 
100 cm. 
110 cm. 
4-7+.. 
0 
2 
1 
0 
0 
0 
@ 
1 
3 
4-7.. 
0 
0 
2 
0 
0 
0 
0 
2 
5 
4-6.... 
0 
0 
1 
0 
0 
0 
0 
1 
4 
4-5.. 
1 
1 
3 
0 
0 
1 
0 
3 
0 
4-4..... 
1 
1 
1 
0 
0 
1 
0 
4 
9 
4-3......... 
2 
3 
3 
0 
0 
13 
0 
2 
9 
4-2.. 
15 
63 
16 
7 
2 
17 
0 
43 
32 
+1.. 
167 
204 
47 
32 
15 
49 
13 
134 
70 
—1 ... ........... 
601 
345 
125 
61 
21 
145 
25 
138 
178 
2... 
64 
105 
70 
48 
54 
223 
22 
149 
303 
-3.. 
13 
10 
12 
15 
23 
110 
22 
119 
78 
4... 
6 
6 
1 
0 
3 
31 
0 
12 
4 
r-5.. ............. 
2 
2 
4 
0 
1 
16 
0 
2 
1 
— 8 ...... 
2 
1 
0 
0 
1 
3 
0 
3 
3 
-7............... 
1 
3 
0 
0 
0 
5 
0 
0 
3 
-74.............. 
0 
0 
0 
0 
0 
6 
0 
1 
1 
Total........ 
Position of cen¬ 
856 
' 746 
285 
163 
120 
622 
82 
614 
693 
ter of firing 1 . .. 
-.6 
—.3 
—.4 
— .5 
—1.3 
—1.2 
—1.1 
-.7 
—.9 
A further series of experiments was made to determine graph¬ 
ically the path of the sporanges as they are discharged toward 
the light. From the experiments already described it is clear 
that as the distance from the source of light increased, the 
sporanges reached the glass at a lower point. But in these 
cases the intensity of the stimulus diminished with the increased 
distance. In the present series the culture was kept at ,110 
centimeters from the opening and the sporanges were inter¬ 
cepted by a glass at various points in their path on the way to 
the opening. The intensity of the light thus did not vary with 
the distance of the culture from the glass. Twenty-four hour 
