Experiments on American and Foreign Building Stones. 11 
Lbs. persq. inch. Relative value. 
4. Grey stone of Florence, .. ; ,0S 
5. Stone of the bridge of St. Maxence, 5,404 231 
6. Travertin, Mentone of ancient Roman 
buildin 4,301 183 
7. Bagneaux neh columns of the “Pan- 
heon, Paris, 3,484 149 
8. Stone of the temple of Paestum, 3 258 130 
[9. Alum limestone, Maryland, ne 334 100:] 
The average relative value of these ancient building stones 
is 238, 
11. Experiments on two-inch cubes of Basalt and Porphyry, 
by Gauthey and Rondelet, reported by the latter in the work 
above cited. 
Lbs. per sq. inch, (Eng.) Relative value. 
29,5 1266 
1. Basalt of Auvergne, ; 3 ,D49 
2. Porphyry, ; ; . 28,455 1219 
3. Swedish basalt, . 27,196 1165 
A. Basalt of Auvergne, 2d variety, 25,172 1078 
do. 0. 3d ee 16,416 703 
[6. Alum limestone, 2,334 100} 
The average relative value of the taal and porphyries is 1086. 
12. Experiments on the alum limestone of Maryland i in blocks 
of other dimensions than two inch cubes, published by Mr. 
Dougherty, the Superintendent of the Washington De a, 
ument, as having been made at the Navy Yard, Washing 
: Per square inch of base. Average. 
1. A l-inch cube (1 sq. inch base), 2000 
2. Another block of the same size, ‘2000 ~=—- Expt. 1 and 2,—2000 
3. A cube of 34 reso on a Pb os ask base) 3265 i 
4 er cube of sa e, 3765 Expt. 3 and 4,—3515 
that 0 22°56 ba :) 5629 
es 0. 43 square, 48 pee high do. 2659 
7 A 4inch cube, (16 inch base,) 5687  Expt.5 and 7,—5658 
he 6th experiment is alledged to have been made on a block 
of unequal thickness and therefore not to give a fair result. 
he first two of the above experiments give results considera- 
bly below the average of Dr. Page’s trials on two-inch cubes. 
The only standard with which we can at present compare them, 3 
is the one inch cube of Italian veined marble tried by Mr. Ren- 
nie, which gave 3216-lbs. per square inch. 'Their relative values, — 
y this comparison, are 100 and 160. Comparing the three aver- 
ages above given, there is an evident increase of ee per 
Square inch of base, dependent apparently in some measure 0 
‘eased size of the specimens. 
e are furnished by the paper of Mr. W. Wyatt of Eng 
with a considerable series of experiments on marbles, gra 
ti 
