1914] JOLIVETTE—PILOBOLUS IOI 
area containing the opening. Experiment 26 shows a total of 
142 sporangia, 54 striking the vertical strip of the left opening, 30 
that of the right opening. Experiment 27 shows 39 and 58 out of 
a total of 204 sporangia on the left and right openings respectively; 
and in experiment 28, 334 sporangia were discharged, 84 on the left 
and 78 on the right opening. 
Throughout the series of experiments some of the sporangia 
failed to hit either opening. In experiment 1, 32 of the 86 spo- 
rangia discharged were of thissort. The distribution on either side 
of the two openings showed considerable variation. There were 
9 sporangia in the 1-cm. strip to the left of the left opening and one 
sporangium in each of the next two strips. In the first 1-cm. strip 
to the right of the opening were 6 sporangia. On the left side of 
the right opening there were 11 sporangia in the first strip and 1 
in the third; 3 sporangia were found in the first strip to the right 
of this opening. 
In the second (table I), 3 sporangia struck the glass within 1 cm. 
to the left of the left opening. In the first, second, and third strips 
to the right of the opening were respectively 4, 2, and 1 sporangia. 
To the left of the right opening were 5 sporangia, all within the first 
strip. The number of sporangia in the first three consecutive 
strips to the right of the opening were respectively 18, 1, 1. The 
distribution and number of scattered sporangia in the remainder 
of the experiments showed about the same degree of variation as 
indicated by the complete data (table I). 
In the foregoing experiments the number of sporangia which 
strike the openings does not appear especially large. These alone 
do not by any means give a complete conception of the accuracy 
of the total discharge of sporangia. A further knowledge of the 
distribution of these sporangia serves to correct the erroneous 
impression given by stating only the numbers that reach or do not 
reach the opening. The accuracy is very striking, for further con- 
sideration shows that 29 of the 32 sporangia that missed the opening 
in the first experiment were found within the 1-cm. strips on either 
side of the openings; only 3.5 per cent fell outside that area. 
A perusal of the remaining data shows practically the same 
accuracy of discharge. The greater portion of the sporangia that 
