POPULAR SCIENCE 



95 



Again, applying the right-hand corner of the stencil (indi- 

 cated by a dotted border) in a similar, but back-handed, 

 manner, we obtain four looking-glass squares : 



thus providing 8 solutions from Key-Table I., while Key- 

 Tables II. and III. each yield a similar number, giving a grand 

 total of 24. Similarly for any of the first sixteen numbers 

 selected. 



Mention has been made above of the " graphs " of these 

 squares, and I will therefore only remark here that some of them 

 produce very pretty patterns. As an example I give a square, 

 derived from Key -Table I., with its graph. 



I should have mentioned that the term " Nasik " is now 

 generally applied to such squares. 



