586 Wisconsin Academy of Sciences, Arts, and Letters. 
sporanges were discharged toward the blue, while when the 
glasses were used over half went toward the blue. Further¬ 
more, the percentage fired toward the yellow solution decreases 
more regularly as the culture is moved toward the blue, al¬ 
though on the whole there are about th© same percentages on the 
blue and yellow respectively as when the glasses were used. 
The detailed results are given in Table XVII. Figure 21 
shows the proportion of sporanges fired toward each of the two 
solutions. 
Table XVII. — Culture at distances indicated. Opening 2 cm in diameter. 
Blue and yellow solutions at opposite ends of the box. 
Distance from yellow. 
2 cm. 
9 cm. 
12 em. 
19 cm. 
Number on yellow... 
41 
15 
12 
8 
Per cent on yellow . 
91.1 
30 
17- 
3.6 
Distance from blue... 
6 cm. 
29 cm. 
25 cm. 
19 cm. 
Number on blue. 
4 
35 
59 
214 
Per cent on blue. 
8.9 
70 
83+ 
96.4 
Xext the red and white glasses were placed at opposite ends 
of the box. With the culture two centimeters from the red and 
36 centimeters from the white, 85% of the sporanges were dis¬ 
charged toward the red. At four centimeters, only one-fourth 
Were sent toward the red. At ,10 centimeters from th© red, 
all were sent toward the white. Table XVIII contains the 
complete data for this series of experiments. Taking the sum 
of the results of this series of experiments, twelve times as many 
sporanges all told were fired toward the whit© as toward the red 
light (Figure 20). The accuracy of aim, as shown by the spo¬ 
ranges which hit the opening with the red light, was very poor, 
just as was the case when the red light was used alone. There 
is no indication that one light affected the accuracy of aim of 
the sporangiophores toward the other. 
Table XVIII .—Culture 2-16 cm. from red. Opening 2 cm. in diameter. 
Red and white lights at opposite ends of the box. 
Distance from red. 
2 cm. 
4 cm. 
6 cm. 
8 cm. 
10 cm. 
12ilcm. 
14 cm. 
16 cm. 
Number on red.. 
66 
13 
1 
1 
0 
0 
0 
0 
Per cent on red.. 
85.6 
29.5 
3.5 
2.5 
0 
C 
0 
0 
Distance from white... 
| 36 cm. 
34 cm. 
32 cm. 
30 cm. 
28 cm. 
26 cm. 
24 cm. 
22 cm. 
Number on white. 
11 
31 
28 
30 
40 
68 
64 
33 
Per ct on white. 
14.4 
70.4 
96.5 
97.5 
100. 
100. 
100. 
100. 
