ASTRONOMY: B. BOSS 
215 
mum, though in the cases of the curves 5 and 10 only one maximum is 
real. That is, in the two cases cited, a slightly different grouping of the 
data would produce great changes in the curves with the exception of one 
maximum which is real. 
Figure 2 gives a graphic representation of the results. The crosses 
mark the positions of the centers of the areas treated. From these 
centers great circles were drawn in the direction obtained by reading off 
the position-angles of the maxima from the curves of figure 1. The 
figure then shows the paths along which there is a strong tendency for 
