IKENBERRY AND SHUTT: DIRECTION GF SOUND. PS 
The right semi-circle in (a) contains eighteen more lines than 
the corresponding semi-circle in (b). Between the other corre- 
sponding semi-circles there is very little difference in the number 
of lines. In the right front quadrant in both diagrams there is a 
point between forty-five and ninety degrees where a considerable 
number of lines congregate. The zero point in (a) gathers to it all 
the lines for a considerable distance on both sides of it. In the 
rest of the circle the lines are more or less scattered. The rear 
semi-circle in both diagrams has a larger number of congregated 
lines than the semi-circle in front. The lines in both diagrams also 
™ 
7 
Fig. (b). 
show an inclination to collect about the two points marked XXV. 
They have an evident preference to group together about certain 
points. 
GENERAL CONCLUSIONS. 
1. A sound can be the most accurately located when it is at one 
side of the person. 
