ts of each secondary with those of
its corresponding primary, the following four fresh figures are
obtained:

Fig. 9 x x Fig. 10 x Fig. 11 x x Fig. 12 x
x x x x x x x
x x x x x x
x x x x

Fig. 9, confronted with Fig. 10 gives a thirteenth figure x
x x
x x
x x

And Fig. 11 confronted with Fig. 12, a fourteenth x
x
x x
x x

Figures 13 and 14, similarly treated, yield a fifteenth figure

x x
x
x x
x x

Which, in its turn, confronted with Fig. 1, gives a sixteenth
and last figure, x
x x
x x
x

Completing the scheme, which shows the result of the operation as
follows:

(1) x (2) x x (3) x (4) x x (5) x (6) x (7) x (8) x
x x x x x x x x x x x x x
x x x x x x x x x x x x
x x x x x x x x x x x x

(9) x x (10) x (11) x x (12) x
x x x x x x x
x x x x x x
x x x x

(13) x (14) x
x x x
x x x x
x x x x

(15) x x
x
x x
x x

(16) x
x x
x x