1189 
In order not to make those equations discord, they have been 
taken from fig. 3 (LID). 
We imagine that in fig. 3 preliminary the circle is only drawn 
and on it the points £, ZE, #,and F,; we take the points Hand # 
arbitrarily. We take the first reaction in order to examine where the 
point A must be situated; hence it is apparent that A and // must 
be situated on different sides of the line /'/,. It is apparent from 
the second reaction that A and F must be situated on the same 
side of the line ZE. Consequently the point A must be situated in 
figure 3 on the are EL, ; now we draw this in the figure and also 
the point A, 
In order to define the position of the point C, we take again the 
first reaction, hence it follows that C must be situated at the same 
side of the line FP, as the point /; consequently point Cis situated 
on the are FEF’. It appears from the second reaction that C and 
F must be situated on different sides of the line HE, ; consequently 
point C must be situated on arc EEK, It follows from both these 
conditions that point C must be situated on are EF. As on this are 
also the point A, is situated, we have still to determine the position of 
C with respect to A,. This follows at once from the third reaction, 
from which it appears that we must take C and £ on different 
sides of the line AA,. Consequently the point C takes its place 
between A, and /’, and the point C,, therefore, between A and #. 
When we determine also in a similar way the position of the 
other points, then we obtain fig. 8; this represents, as is easily 
seen, the six schematical reactions. For the deduction of this figure 
the six reactions are not exactly wanted, this is not accidental; but 
