92 



SCIENCE PROGRESS 



Diagram A. 



Diagram B. 



New Primary Squares. 



Each of these new primary squares also give us a further 

 sixty-four solutions (or 128 if looking-glass forms be included). 



The result is a grand total of 192 forms (or 384 if looking- 

 glass solutions be added). 



The following Key-Tables (I., II., and III.) present all these 

 solutions in a compact form. 



To use them the reader can readily make a stencil by cutting 

 out of a piece of cardboard a square hole of the exact size 

 required to embrace 1 6 cells of a key-table. 



Key-Table I. 



Key-Table II. 



