TESTS OF WISCONSIN BUILDING STONE 567 



ferruginous or siliceous cement. Each sample by itself has 

 peculiarities in texture and composition which either add or 

 detract from the strength and durability of the stone. 



Plates VII, VIII, IX, X, and XI, with the accompanying 

 explanations, illustrate the character of several of the Wisconsin 

 building stones and the elements which contribute to their 

 strength and durability. 



E. R. Buckley. 



