440 
F. D. HEALD AND R. A. STUDHALTER 
little difference between the temperatures at the two stations. The 
earlier start at Martic Forge is accounted for by the fact that the 
pustules over which the traps were set were on the whole much younger 
and in better condition to expel spores than those at West Chester. 
During the seasons of perithecial activity for both 1913 and 1914, a 
larger percentage of the traps at Martic Forge expelled spores than 
at West Chester. Furthermore a much more copious expulsion was 
obtained from individual traps at Martic Forge. 
Table IX 
Records for Ascospore Traps, Martic Forge, Pa., Spring and Summer, 191 4 
Rainfall 
Temperature 
Percentage of 
Traps Showing 
Date 
Amount, Inches 
Max. 
Min. 
Expulsion 
Apr. 
20 
.59 
67 
53 
10.8 
25-26 
1.57 
68 
44 
2.7 
May 
5 
I. II 
66 
60 
27.0 
8 
.13 
62 
50 
32.9 
12 
.40 
81 
47 • 
16.2 
June 
28 
.42 
87 
60 
5.6 
4 
.42 
72 
64 
46.6 
8 
18 and 21-23 
.22 
97 
65 
20.8 
.97 
91 
50 
43.1 
23-25 and 28 
2.10 
94 
62 
68.6 
July 
2-3 
1.63 
80 
54 
55^6 
4-5 
.28 
73 
57 
78.1 
10 and 12 
•95 
90 
66 
69.2 
13-14 
•23 
84 
65 
69.9 
14-15 
•53 
86 
66 
75.3 
15-16 
2.31 
86 
66 
53^4 
24-25 
1. 17 
91 
67 
45^8 
28 
2.61 
81 
55 
56.2 
Table X 
Summary of the Number of Rain Periods and Number of Times Spores were Expelled 
at Martic Forge, Pa. 
Period 
No. of Rain 
Periods 
Amount of Rain 
in Inches 
No. of Rains During 
which Expulsion 
Occurred 
Jan. 
29, 
1913-Mar. 13, 
1913 
10 
2.03 
0 
Mar. 
14. 
1913-N0V. 9, 
1913 
38 
31.94 
33 
Nov. 
10, 
1913-Apr. 19, 
1914 
23 
14.16 
0 
Apr. 
20, 
1914-July 31, 
1914 
18 
17.64 
18 
Under laboratory conditions the minimum temperature for asco- 
spore expulsion was found to be between 50 and 55° F. While it 
was impossible to get the maximum and minimum temperatures for 
