REPORT OF PROF. FRANCIS A. WILBER 



359 



and as soon as its extremity began to show signs of melting the heat was 

 guarded. At the first fusion the heat was turned off. The muffle was at 

 once opened and the samples removed and laid upon a clay support in the 

 open air. They cooled rapidly. As soon as cool their condition was noted. 

 The strength of the cold samples was roughly tested by light blows with a 

 hammer. The comparative results of this test will be found in column 24 of 

 the table. 



in order to prove the uniformity of different selected blocks of stone from 

 the same quarry, small cubes were cut from different blocks of the same 

 stone in several of the samples, and each of these cubes treated as an in- 

 dependent sample. 



From C, 2183, three cubes, marked (a), 



From C, 2185, three cubes, marked (a). 



From C, 2186, four cubes, marked (a), 



From C, 2187, four cubes, marked (a), 



From C, 2188, two cubes, marked (a), 



From C, 2189, three cubes, marked (a), 



From C, 2190, three cubes, marked (a), 



From C, 2225, three cubes, marked (a), 



The results of the comparisons of the same stone will be found in columns 

 5, 6, 14, 15, 17, 18. The agreement in these cases was so close that it seemed 

 unnecessary to continue the comparisons further with other samples, and the 

 cubes selected for the various tests may, therefore, fairly be considered 

 representative ones for each particular quarry. 

 22 



b), (c), were taken, 

 b), (c), were taken. 

 b), (c), (d), were taken, 

 b), (c), (d), were taken, 

 b), were taken, 

 b), (c), were taken, 

 b), (c), were taken, 

 b), (c), were taken. 



