366 BULLETIN OF THE NEW YORK STATE MUSEUM 



Per cent 

 absorbed. 



Sandstone, Belleville, New Jersey 5.32 



Sandstone (Worcester), Norcross Bros., East Longmeadow, Mass ... 5.43 



Sandstone, Berea, Ohio • 6 . 80 



Sandstone, Portage, Lake Superior, Michigan 8.71 



Sandstone, Nova Scotia, . . 1 8 . 07 



A comparison of the percentage of absorption capacity 

 and the specific gravity of these sandstones, by means of 

 graphic illustration, shows that the absorption, in general, 

 varies inversely as the specific gravity. And there are three 

 groups, indicated by a study of the curves representing 

 these elements. They are : 



Maiden blue-stone. 

 L -{ Duanesburgh blue-sione. 

 Oxford blue sandstone. 



Potsdam red sandstone. 

 Albion sandstone. 

 Olean sandstone. 

 Hulberton sandstone. 

 IL ( Portland, Connecticut, sandstone. 

 Portage sandstone. 

 Warsaw sandstone. 

 Bristow, Virginia, sandstone. 

 Oswego Falls sandstone. 



East Longmeadow, Massachusetts, sandstone. 

 Belleville, New Jersey, sandstone, 

 in. ( Berea, Ohio, sandstone. 



Portage, Lake Superior, Michigan, sandstone. 

 Nova Scotia sandstone. 



The higher specific gravity and lower absorptive capacity 

 of the blue-stones is notable, and accords with a wide ex- 

 perience in their use. The difference between them and 

 the Potsdam and Medina sandstones, which are placed here 

 in the second group, amounts to 1.5 per cent, equivalent to 

 2.4 pounds of water absorbed by a cubic foot of the stone. 

 In the third group the water absorbed exceeds 4 per cent, 

 and is equivalent to at least 6.75 pounds in weight. The 



