370 BULLETIN OF THE NEW YORK STATE MUSEUM 



L Unchanged. 



Sandstone, Potsdam. 



Blue-stone, Maiden. 



Blue-stone, Oxford. 



Blue-stone, Duanesburgh. 



Sandstone, Albion. 



Sandstone, East Longmeadow. 



Sandstone (coarse-grained), Portland, Connecticut. 



Sandstone, Belleville, New Jersey. 



Sandstone, Bristow, Virginia. 



Sandstone, Nova Scotia. 

 IL Slight flaws and slight checks. 



Sandstone, Warsaw. 



Sandstone, Olean. 



Sandstone, Berea, Ohio. 



Sandstone, Portage, Lake Superior, Michigan. 

 IIL Slight scaling. 



Sandstone, Portage, Wyoming County. 

 IV. Chipped. 



Sandstone (fine-grained), Portland, Connecticut. 



Sandstone (Maynard), East Longmeadow, Massachusetts. 



Sandstone (Kibbe), East Longmeadow, Massachusetts. 



Sandstone, Hulberton. 

 V. Badly checked. 



Oswego Falls sandstone. 



Noting the ejEfects produced by exposure to a high tem- 

 perature (1200''- 1400° F.) and sudden cooling, the sandstones, 

 as tested, may be grouped as follows : 



L Strength impaired but little. ^^^ 



Sandstone, Potsdam. 

 Sandstone, Albion. 

 Sandstone, Hulberton. 

 Sandstone, Portage. 

 IL Strength not greatly impaired. 

 Blue-stone, Duanesburgh. 



Sandstone, Portage, Lake Superior, Michigan. 

 Sandstone, Bristow, Virginia. 



III. Strenght somewhat, but not wholly impaired. 



Blue-stone, Maiden. 



Sandstone (Maynard), East Longmeadow, Massachusetts. 



Sandstone, Oswego Falls. 



IV. Badly checked. 



Sandstone, Warsaw. 

 Sandstone, Oxford, 



