NOTES ON THE TABLE OF TESTS 371 



V. Strength greatly impaired — Stone greatly weakened. 

 Sandstone, Olean. 

 Sandstone, Nova Scotia. 

 VI. Strength gone — Crumbled with a blow. 



Kibbe sandstone, East Longmeadovv, Massachusetts. 

 Worcester sandstone, East Longmeadow, Massachusetts. 

 Sandstone (fine-grained), Portland, Connecticut. 

 VII. Strength gone — Crumbled with touch. 



Sandstone (coarse-grained), Portland, Connecticut. 

 VIII. Strength entirely gone. 



Sandstone, Belleville, New Jersey. 

 Sandstone, Berea, Ohio. 



Omitting the lesser distinctions, these results, obtained 

 by the test at a high temperature, may be roughly grouped 

 in two divisions. In the one, where the strength is not 

 wholly impaired, the sandstones of the state are found ; in 

 the other, wherein the strength is gone, are : the sandstones 

 of East Longmeadow, Massachusetts, of Portland, Connec- 

 ticut, Belleville, New Jersey, and Berea, Ohio. Of the 

 stones from the state, it may be noted that the Potsdam 

 and Albion sandstones are in the first group in both the 

 freezing and the heat tests. The compact blue-stones from 

 Maiden and Duanesburgh, appear to have suffered a slight 

 loss of strength at the high heat test. The Oxford blue 

 sandstone was checked badly. 



The results are not altogether parallel in the two series, 

 as, for example, the Belleville, New Jersey, sandstone, 

 which was unchanged in the freezing and thawing tests, 

 lost its strength entirely in the furnace heating. The be- 

 havior of the Nova Scotia stone was somewhat similar to 

 that from the Belleville. The explanation of these differ- 

 ences is in the structure. Although both of these sand- 

 stones are porous and have a relatively large capacity of 

 absorbing water, they are not laminated, but homogeneous, 

 and hence did not show checks or scaling. The specimen 

 of Berea sandstone was laminated, and it checked in freez- 

 ing and thawing, and was ruined by the high heat test. 

 The conditions of exposure, imitated in these two series of 



