1914] JOLIV ETTE—PILOBOLUS 113 
(47 per cent) on the opening strip. In the third experiment, the 
ratio of the percentages of those on the 1-cm. strip containing the 
opening, in the case of the tantalum lamp, to that on the correspond- 
ing strip in the case of the tungsten is as 57 to 61. In the fourth 
experiment the accuracy of aim is very nearly the same toward 
the two lamps, although a greater proportion of the total number 
favor the tantalum lamp. The comparison of a 40-watt tantalum 
lamp against a 20-watt tungsten shows that a larger number of 
sporangia are discharged toward the tantalum, but that there is 
very little difference as regards the accuracy of aim toward the 
two lamps. 7 
As in the set of experiments last described, a close examination 
of the data (table VII) reveals the fact that most of the sporangia 
that missed the vertical strips containing the openings were found 
within 1 cm. of them. An average of 7.8 per cent struck the glass 
more than 1 cm. laterally from the opening. © 
TABLE VII 
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Total 3§ 22 
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+ nun 
TSO sang casa eater micacer Weer ican SJ 
Pe fee ils evicted a 1 01887 420/IIO) 3%) It) 5 |I0 | § | 3 | 12) 40/149 s3| 3 |... | ae 
407 s++]e+-/.-.]..-| 3 [ 80] 16x] 40] r2] 7} 51515131 3 37 | 13 
125 toelessfeesfeee[o.-| 181 gO] ro] 2 TSE Wc ste t 
ttt Nees Oe te Ey... 4 38) BERT a8 s eet 5 23| 45 | 15] | | | 
a! 
A 40-watt tantalum lamp was next compared with a 32-candle- 
Power carbon filament with the results shown in table VIII. The 
first experiment gave a total of 96 sporangia, 36 of which were dis- 
charged toward the tantalum and 60 toward the carbon. The 
second experiment gave a total of 231 sporangia, with 164 fired 
toward the tantalum and 67 toward the carbon. In the third 
experiment 365 sporangia struck the glass, 268 over the tantalum 
and 96 over the carbon. In the fourth experiment, of the 157 spo- 
Tangia fired, 98 were on the glass over the tantalum and 59 over 
the carbon. The fifth experiment showed a total discharge of 1039, 
se pe found on the glass before the tantalum, 465 before the 
n. In the remainder of the experiments, as can be seen from 
