I1O BOTANICAL GAZETTE [FEBRUARY 
discharged toward the tungsten lamp, 49 (80 per cent) struck 
within the corresponding strip. 
In the second experiment, of the 163 sporangia discharged, 
68 were discharged toward the carbon filament, 47 (69 per cent) 
striking the 1-cm. strip over the opening; 95 were discharged toward 
the tungsten, 54 (56 per cent) on the strip over the opening. In 
this experiment, unlike the first, the larger percentage struck the 
strip over the opening in the case of the carbon filament. 
In the third experiment, 387 sporangia were discharged toward 
the carbon; 203 (51.7 per cent) of them in the vertical strip con- 
taining the opening; 397 were discharged toward the tungsten, 
253 (65.2 per cent) on the region of the opening. 
The fourth experiment shows 69 sporangia, which is 61 per cent 
of the 113 sporangia discharged, toward the carbon, on the 1-cm. 
strip containing the opening; and 607 (61 per cent) of the 1003 
sporangia fired toward the tungsten on the same region. 
The remaining experiments of this series all show greater accu- 
racy in the tungsten light than in the carbon filament light. With 
one exception, that of the second experiment, the discharge of the 
sporangia is more accurate toward the 20-watt tungsten used than 
toward the 32-candle-power carbon filament lamp, although the 
energy of the tungsten lamp is only half that of the carbon Jamp. 
Again, the percentages which strike the openings probably do 
not at first glance appear remarkable, but on noting in the first 
experiment that the 12 sporangia that did not strike the opening in 
the case of those fired toward the carbon light were all within 1 cm. 
of it, the accuracy is striking. Of the 19 sporangia which failed 
to strike the opening before the tungsten lamp, 16 were within 
1 cm. of the opening and the remaining 3 were within 2 cm. of the 
opening. 
In the second experiment, 21 of the sporangia fired toward the 
carbon light missed the vertical strip containing the opening; 17 of 
that number were within 1 cm. distance of the strip. Of the 41 
sporangia that missed the opening in the case of those fired toward 
the tungsten, 35 struck within 1 cm. of the opening. 
In the remaining experiments, most of the sporangia which 
failed to reach the opening in the strips fell within the first 1-cm. 
