ASCOSPORE EXPULSION OF ENDOTHIA PARASITICA 439 
tures favorable for perithecial activity were first offered on March 14, 
19135 when 2 percent of the traps shot spores following a rain of 
1.29 inches. From March 14 to November 9 there were 38 rain 
periods with precipitation varying from 0.02 to 3.47 inches (Table VII). 
During most of these rain periods there was abundant expulsion of 
ascospores, and following seven of them all of the traps expelled 
spores. After November 9 the temperatures were again unfavorable 
Table VIII 
Records for Ascospore Traps, Martic Forge, Pa., Fall and Winter, iQij-14 
Rainfall 
Temperature 
Percentage of 
Traps Showing 
Date 
Amount, Inches 
Max, 
Min. 
Expulsion 
Nov. 8-9 
.91 
58 
33 
83-3 
" 15-16 
.83 
40 
25 
0 
" 27-29 
•54 
49 
32 
0 
Dec. I 
.06 
44 
33 
0 
7 
•51 
52 
37 
0 
" 21 
•13 
49 
26 
0 
" 23-25 
2.25 
49 
28 
0 
Jan. 3-5 
2. II 
41 
25 
0 
" 24 
1. 21 
47 
39 
0 
" 31 
.83 
61 
34 
0 
Feb. 6-7 
.48 
46 
24 
0 
" 13-14 
1. 12 
30 
3(?) 
0 
19 
.62 
31 
26 
0 
Feb. 28-Mar. I 
.38 
40 
18 
0 
Mar. 5-6 
•72 
36 
17 
0 
II 
•03 
30 
18 
0 
20-22 
•34 
37 
17 
0 
" 28 
•36 
59 
36 
0 
Apr. I 
8 
.28 
45 
35 
0 
•59 
65 
35 
0 
" II 
.07 
59 
33 
0 
" 15 
.70 
45 
39 
0 
" 20 
•59 
67 
53 
10.8 
for perithecial activity, and no expulsion occurred for any of the 
21 rains between November 10, 191 3 and April 15, 1914 (Table VIII). 
Beginning with April 20, with the return of higher temperatures, 
there was again an abundance of expulsion following every rain 
period until July 31, 1914, when the work was discontinued (Table IX). 
It will be noted (Tables I and VI) that in the spring of 1913 
expulsion began at Martic Forge a few days earlier than at West 
Chester. In the fall of 191 3 perithecial activity ceased with the 
same rain period at both places, but in the following spring the Martic 
Forge traps were again the first to expel spores. There was very 
