A Dry Rot of the Irish Polato Tuber 
29 
Table 4. — Representing in percentages the fluctuation of spore 
septation of a culture grown in a room, temperature 20° to 
27° C, humidity 40 to 55 per cent. 
February 16 
February 23 
March 1 
- 
March 8 
O-septate. 
Tube A 
g 
12 
17 
B 
5 
12 
2 
9 
C 
5 
11 
D 
8 
4 
10 
Average . . 
7 
9 
8 
13 
1 -septate. 
Tube A 
68 
79 
88 
78 
B 
72 
76 
83 
81 
C 
* 73 
77 
D 
88 
82 
82 
Average . . 
75 
79 
83 
80 
2-septate 
Tube A 
18 
6 
3 
5 
B 
13 
8 
10 
7 
C 
13 
10 
D 
1 
13 
7 
Average . . . 
11 
9 
8 
6 
3-septate. 
Tube A 
6 
3 
2 
£::::: 
10 
4 
5 
9 
.... 
2 
D 
3 
_ 
Average .... 
7 
3 
3 
1 
