566 Wisconsin Academy of Sciences, Arts, and Letters. 
opening was kept constantly at 42 centimeters. The drying 
out of the culture was to some extent prevented by supporting 
a dish of water on the stand just below the culture. 
The sporanges were caught on a glass plate placed inside 
against the end of the box, and their position on and about the 
openings was recorded on a sheet of paper divided into equal 
areas by parallel vertical lines one centimeter apart. The 
openings are represented by two circles one centimeter in diam- ' 
eter. Figure 14 show T s the chart for an experiment with the 
openings 10 centimeters apart.' The number of centimeter- 
wide areas between the'openings of course increased as the 
openings were moved farther apart. The number of sporanges 
striking within each area, was recorded separately. 
We found in these cases, as in the preliminary experiments, 
that a large proportion of the sporanges landed in the vicinity 
of one or the other of the two openings. Throughout the series 
(Table IX) in which the distance from the center of one open¬ 
ing to the center of the other varied from 2 to 26 centimeters, 
fully three-fourths of the total number of sporanges fell upon 
the vertical areas which included the openings or within 2 cen¬ 
timeters to right or left. 
When the centers of the openings were only 2 centimeters 
apart, the two groups of sporanges were not distinct. They 
overlapped so as to present the appearance of a single broad- 
centered group. Of a total of 201 sporanges, 39 were on the 
area containing one opening, 49 on the other, and 52 sporanges 
on the area between the two. (Table IX). 
In the first five experiments of the series (Table IX), in 
which the distance between the openings Was increased from 
