560 Wisconsin Academy of Sciences, Arts , and Letters. 
exposures were made, with the glass successively at 10, 20, 35, 
50, 65 and 85 centimeters from the culture. The target de¬ 
scribed in the preceding experiment (Fig. 10) wtas used in re¬ 
cording the distribution of the sporanges. When the glass was 
ten centimeters from the culture, the center of distribution of 
the sporanges was 0.9 centimeter below the median line. With 
—- 
£-- 
v 
SL 
2. 
_____— 
_ _ _ .£ _—. 
__ k. _ 
7 
?-C 
rig-. 10. 
the glass 25 centimeters from the culture, the center of distribu¬ 
tion was 1.1 centimeters below; and with the glass at 35 and at 
50 centimeters, the center of distribution was in each case 1.2 
centimeters below. The center of distribution sinks to 6.2 
centimeters below the median line with the glass at 65 eenti- 
Table VII .—Culture 110 cm. 
Culture at . 
10 cm. 
25 cm. 
35 cm. 
50 cm. 
65 cm. 
85 cm. 
+7+. 
0 
0 
2 
0 
1 
2 
+7 . 
0 
0 
0 
1 
0 
0 
+6. 
0 
0 
0 
0 
2 
1 
+5. 
0 
3 
2 
0 
4 
1 
+4 . 
0 
3 
1 
2 
8 
2 
+3.*. . 
0 
9 
1 
2 
64 
5 
+2. 
0 
14 
8 
20 
194 
2f 
+1. 
26 
52 
30 
27 
205 
43 
— 1 . 
49 
178 
87 
68 
281 
46 
2 ...... 
48 
222 
129 
90 
173 
29 
— B ... 
27 
98 
116 
79 
116 
44 
—4 . 
4 
24 
59 
84 
107 
31 
— 5 . 
0 
3 
32 
30 
87 
32 
-6. 
0 
2 
12 
15 
65 
22 
—7 . ... 
0 
1 
10 
11 
63 
26 
-7+. 
0 
6 
12 
11 
91+521 
61+344 
Total. 
Center of distri¬ 
bution of spor¬ 
154 
615 
501 
438 
1,982 
816 
anges.,. 
-9 
—1.1 
—1.2 
—1.2 
—6.2 
—124 
