ERROR TO CASES OF NORMAL DISTRIBUTION AND CORRELATION. 145 
Fig. 12 shows the form of this diagram for the case of D = ^tt, so that it is 
produced by shifting fig. 7 from right to left through one-eiglith of its whole breadth. 
The dotted lines in fig. 10 (p. 143) show the position of the corresponding planes 
dividing the standard solid into 100 portions; the angle between the two sets of lines 
Fig. 12. 
ordinate are respectively ‘25335, ‘52440, ‘84162, and 1‘28155, the radius of the 
circle shown in the figure being the unit. If instead of dividing up the base^plaiie, 
as in fig. 10, in the manner explained in (1.) (i.) above, we had divided it up by 100 
radial lines and 99 circles as explained in (1.) (ii.), these lines and circles would 
become vertical and horizontal straight lines dividing the diagram (fig. 12) into 
10,000 equal squares. 
VOL. CXCII.-A. U 
