ASCOSPORE EXPULSION OF ENDOTHIA PARASITICA 433 
Table II 
Ascospore Trap Tests, Records for West Chester, Pa., 1913 
Rainfall 
Temperature 
Percentage of Trap 
Showing Expulsion 
Date 
Amount, Inches 
Max. 
Min. 
1 .04 
03 
49 
47 
T T C 
I.Io 
09 
1 8 
30 
47 
Apr. 4 
0.56 
70 
44 
21.5 
10—13 
2.49 
crS 
50 
27 
36.5 
" 13-16 
1-57 
07 
41 
4 
27 28 
2-43 
74 
A 8 
4» 
Ac ^ 
054 
29 
0.1 1 
50 
54 
8 
0.65 
80 
yl8 
4» 
46.4 

3-24 
77 
4" 
70.3 
^ 27 20 
0.69 
72 
53 
8-5 -5 
o3'3 
June 7 
0.12 
03 
04 

0.00 
00 
02 
50 

0.02 
82 
05 
I I.I 
24 
0.19 
70 
05 
52 
0.22 
OO 
AA 
DO 
AA 
DO 
July 5-6. . 
O.IO 
92 
09 
28.8 
1^ 9 
0.30 
75 
cA 
50 
47.1 
4, ■ *q' 
0-75 
86 
cA 
50 
88 c 
5(5.5 
0.20 
8*7 
07 
57 
27-5 
0.05 
o2 
4 
24 
0.04 
SQ 
00 
AA 
4 
0.06 
91 
70 
0 
29-30 
0.74 
90 
68 
60.8 
0.05 
03 
72 
II-5 
6 
I 98 
8-5 
°6 
62 
74 
" 10 
0-37 
93 
72 
75-5 
" 18 
0.03 
93 
70 
0 
" 19 
0.40 
80 
62 
67.6 
" 22 
0.25 
76 
50 
63-4 
" 27 
0.175 
85 
63 
50.7 
" 29-30 
I.IO 
81 
62 
74.6 
Sept. 7 
0.37 
86.5 
66.5 
62.8 
" 13 •••• 
0.095 
70 
58 
18.5 
" 17-18 
0.26 
74-5 
52 
57.7 
" 18-19 
0.68 
74-5 
58 
62 
" 19-20 
0.09 
65.5 
57 
34-2 
20-22 
1.26 
79 
48 
77.1 
Oct. 1-3 
1.30 
71 
52 
54-3 
" II 
0.73 
69.5 
62 
67.1 
" 19-20 
0.86 
69 
50 
64.3 
" 20 
0.08 
69 
54 
2.8 
1.44 
64 
49 
74-3 
Nov. 8-9 
1. 00 
60 
37 
54-3 
The percentage of traps showing expulsion for any rain period 
during the season of perithecial activity varied from o to 88.5 (Tables 
I— IV). The failure to get expulsion of spores from all traps depended 
on the following conditions: 
