10 Experiments on American and Foreign Building Stones. 
8. Experiments on Marbles, made in France by Rondelet, Gau- 
they, Suffiot and Perronet,* on two inch cubes, the weights an 
measures being reduced to English to conform to the other 
Series. 
Lbs. per. sq. inch. ' Relative val- 
480 
1. Black marble of Flanders, ; 
2. Cervelas marble of Flanders, : 5,738 245 
3. White Statuary marble, ‘ ; 4,652 199 
4. Blue Turquin marble, . ‘ , 4,328 185 
5. Veined white marble, A241 181 
6. Veined white marble called Pauf, . 3,701 158 
[7. Alum limestone of Md., as above, 2,334 100] 
Note.—With the exception ‘of the first of the above trials the 
French experiments conform pretty nearly with those of Mr. 
Rennie on similar materials supposing the numbers given by the - 
latter were obtained from two inch cubes; but they fall far below 
his results, admitting, with Tredgold, that his blocks were 1 
inch cubes. Gregory appears to have understood that all Ren- 
nie’s experiments were made on 14 inch cubes unless otherwise 
expressly state 
Experiments of Rondelet and other French experimenters 
on two-inch cubes of granite. 
Lbs, per. sq. inch. Relative value. 
536 
1. Oriental rose granite . 12, 
2. Granite of Normandy called 
Champ du Bout, . 11,628 498 
3. Granite of Normandy called 
Gallicien ; ; 9,987 428 
4. Granite of Bretagne, ‘ : 9,303 398 
5. Green granite of Vosges, ‘ 8,798 376 
6. Beola granite used in Milan, . 6,603 282 
7. Grey granite of Vosges, . 6,020 257 
[8. Alum limestone of Maryland, 2,334 100] 
The average relative value of the seven ire above cited is 
396, or almost four times that of the “alum 
eriments on stones used in the eaiite sion of various 
ancient edifices, reported by Rondelet,—size two inch cubes. 
Lbs. per. sq. inch, Relative value. 
. 1. Caserté stone of Italy, 8,584 
2. Stone of Istria used by Palladio, San- 
covino and Scamozze in the edi- > 7,395 316 
»  fices of Venice and Vicenze, 
_ 3. Fourneaux stone, pillars of All Saints 
+ Church at Angers, ‘ » BLT 270 
vera theorique sag pratique de Tart de batir. "Par Jean Rondelet, tom. i. P . 
