502 Journal of Agricultural Research Vol. IIL, No, 6 
The next two days were fair, and as was expected for these weather con- 
ditions, no spores of this Endothia were caught. In the evening of August 
22 there was a rain of 0.25 inch; 6 plates, therefore, were exposed early 
the next morning before the sun had dried the vegetation. Although 
the ascospore traps gave evidence that expulsion had occurred, no posi- 
tive results were obtained, which is explained by the fact that again too 
long a time had elapsed after the rain ceased. 
Dry, hot weather now continued until the afternoon of August 27, and 
the exposure plates yielded no evidence of the presence of spores of Endo- 
thia parasitica in the air. In the afternoon of August 27, however, two 
thunder storms occurred, in consequence of which the regular routine 
was departed from. Tables II and III show the outcome of the tests of 
this date. After the first storm two sets of plates were exposed in the 
course of an hour and a half. Two out of the second set yielded colonies 
of E. parasitica. Since the ascospore-trap tests (Tables X and XVII) did 
not give evidences of expulsion occurring when the first five plates were 
exposed, negative results were to be expected in those plates, and it is 
not surprising that only two out of the second set of seven plates yielded 
colonies of E. parasitica when the 19 aseospore traps examined for this 
particular period showed evidence of expulsion from only one perithecium. 
The meagerness of these results is partially accounted for by the small 
amount of rain, rapid drying, and the fact that the perithecia had hardly 
been wet a sufficient length of time. 
Tax LE III.—Record of exposure plates made on August 27, 1913, at West Chester, Pa. 
BEFORE RAIN. 
Wind. er 
ire Time. Length of| Station = Roe ‘ noe pele 
0. exposure. No. Direction. see per Ro of fungi. ee 
: Minutes. 
4359 | 8.35a.m..... 4 r| SW. 1.6 2 7 ° 
4360 | g.oga.m..... 5 3| SW. 1.6 I 8 ° 
4361 | 9.32 a.m..... 5 z| SW. 1.6 I 6 ° 
4362 | 10.03 a2. m.... 5 13 | SW. 1.6 ° 6 ° 
4363 |, 10.29 a.m.... 6 14| SW. 1.6 I 7 ° 
4364 | 10.57 a.m.... 5 3 W. 1.6 3 9 ° 
4365 | 11.344. m.... 5% I W. 7 2 19 ° 
4366 | 11.57 a.m.... 5 I W. L7 ° 15 fC) 
4367 | 1.16p.m..... 5 I W. 1.7 ° 22 ° 
4368 | 1.39 p.m..... 5 13 Ww. 1.7 ° 33 ° 
4369 | 2.09 p.m..... 5% 13 Ww. ref I 13 ° 
4370 | 2.45 p.m..... 5 3 Ww. Tg I 7 ° 
RAIN NO. x (0,12 INCH, 3.15 TO 3.28 P. M.) 
4371 | 3.48p.m..... 7 3 W. 24 I 12 ° 
4372 | 3-50p.m..... 6% 15 W. 2.4 ° 10 ° 
4373 | 3-49 p.m 6§ 3| W. |e 24 ° 17 ° 
4374 | 3-48 p.m..... 634 I W. 2.4 ° 32 fC) 
4375 | 3-51 p.m..... 7 8 W.. 24 ° 9 ° 
4376 | 4.10p.m..... 9% 6 Ww. Trace. ° 7 I 
4377 | 4.12 p.m..... 834 II Ww. Trace ° 8 ° 
4378 | 4.14 p.m..... 8} 3 Ww. Trace 2 15 ° 
4379 | 4.15 p.m™..... 8 16|/ W. Trace ° Ir ° 
4380 | 4.17 p.m..... 5 us| W. | Trace I 9 ° 
4381 | 4.40p.m..... 4 31] W. Trace ° 4 ° 
4382 | 5.12 p.m..... 6 |. 3) Ww. Trace I 13 3 
