438 
F. D. HEALD AND R. A. STUDHALTER 
At the beginning of our work it was an open question as to whether 
perithecial pustules would exhaust their power to expel spores during 
the course of a single season. Our records show that bark bearing 
stromata with perithecia that probably were active during the season 
of 1 91 2, gave an abundant expulsion during the season of 191 3 (Traps 
1-49). For these same traps there was either no expulsion or it was 
irregular and spasmodic during the season of 1914. Somewhat more 
certain evidence of the continuation of perithecial activity during 
two seasons is shown by the records for traps 57-75 from which 
there was an abundant spore expulsion during the season of 1 91 3 
and the part of the season of 191 4 covered by our observations. This 
duration of ascospore expulsion from the different traps and also 
their seasonal activity is represented in an accompanying chart 
(Fig. 3)- 
Records were obtained on the majority of the 76 traps for the 
entire period covered in this report. Sixteen traps were discon- 
tinued before the expiration of the work for various reasons. In 9 
cases the bark was shed from the tree due to the action of blight and 
accessory agencies, in 4 the bark was overgrown by sporophores of 
sap rot fungi, while one was overrun by a foreign mycelium. 
The Traps at Martic Forge 
A total of 75 ascospore traps were set in the chestnut orchard at 
Martic Forge on Paragon trees ranging from 3 to 12 inches in diam- 
eter. The pustules over which the traps were placed were in varying 
stages of development, but were on the whole much younger than 
those at West Chester. 
The first traps (1-41) were set on January 21-24, 191 3 5 four 
(42-45) were added on January 31; three (46-48) on February 10; 
and two more (49-50) on February 12. An addition of twenty-five 
traps (51-75) was made early in October 191 3, and the first record 
on these was taken for the rain of October 11. These last 25 traps 
were placed over pustules which had just reached sufficient maturity 
to expel spores during the season of 1913. 
The Results from the Traps at Martic Forge 
There were 10 rain periods between January 29 and March 13, 
1913, with a precipitation ranging from 0.02 to 0.70 inches (Table VI). 
No expulsion of ascospores occurred during this period. Tempera- 
