Miscellaneous Papers. 



241 



parently different may be formed by simply transposing one 

 or more lines from any one side of the square to the opposite 

 side, without in any degree changing the perfection of the 

 square. This makes ninety-six perfect squares that can be 

 made from that one scheme. 



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The construction of schemes for perfect squares is hedged 

 by the necessity of having not more than two arrow-points in 



-16 



