548 Wisconsin Academy of Sciences, Arts, and Letters. 
sible to grow cultures which have the sporangiophores uni¬ 
formly distributed over the surface. Preference was given to 
evenly distributed cultures when such were available, but many 
were used in which the majority of the sporaniophores were 
aggregated in the middle, at one side or around the edge. |That 
the arrangement of the sporangiophores on the surface of the 
culture affects the.records may be seen from the following ex¬ 
periments. In the apparatus described above, a culture was 
placed 110 centimeters from the opening, the center of the cul¬ 
ture being exactly opposite the middle of the four centimeter 
opening. White daylight was used as before. The glass for 
catching the sporanges, instead of being against the opening, 
was placed at a distance of only ten centimeters from the cul¬ 
ture. The culture chosen in this case had the majority of the 
sporanges arranged about the periphery in the shape of a horse¬ 
shoe, and it was placed so that the open, side of the horse-shoe 
was downward. .Figure 8 represents the results obtained. 
The configuration of the culture was reproduced with fair ac¬ 
curacy on the glass. It is manifest that if the horse-shoe had 
been placed with the other side up, the percentages in the dif¬ 
ferent areas wmild have been markedly different. If the ma¬ 
jority of the sporangiophores had been centrally instead of 
peripherally located, the percentage of sporanges striking the 
opening would have been greater. 
On the following night the same culture was placed at a dis¬ 
tance of ten centimeters from the opening. The majority of 
the sporangiophores appeared to be arranged essentially as on 
the preceding night. The glass was against the opening, that 
is ten centimeters from the culture as before. Figure 9 shows 
the result. There is a pronounced difference in the distribution 
of the sporanges in the two cases. In the former the configura¬ 
tion of the culture is evident; in the latter the arrangement of 
the sporanges does not indicate their position bn the culture. 
Comparison of these two results is interesting from another 
point of view. In the earlier experiments when the glass was 
kept at the opening, it was certainly true that a decreasing pro¬ 
portion of sporanges reached the opening as the culture was 
