( 544 ) 



We shall now give in both systems of coordinates the coor- 

 dinates of the vertices of the live concentric cells and we divide in 

 doing so — see the following table — the sixteen vertices of Cg^' 

 into the eight vertices of 6"„ and the eight vertices of C'\^; to 

 that end it is necessary for distinction to indicate whether the product 

 of the coordinates is positive on negative. 



With the aid of this it is easy to find both quadruples of coordinates 

 of the systems of the points K, F, R of the five cells. They are given 

 in the following table, which after all the preceding is clear in itself. 



Of course the axes, of which the number is given each time, 

 agree in nature with the points connected by them with 0. So the 



