1 12 Analysis of Limestone. 



bole.) Fracture uneven: Surface, splintery, small 

 sparkling chrystals. I obtained in 100 parts, silex 4, 

 alumina 2, carbonat of magnesia 14, The rest was pure ' 

 limestone. 



No. 4. Cleaver's. Colour, blueish grey : Fracture 

 uneven in one direction, but splitting into lamina of 

 about half an inch thick in the other ; there was a very 

 thin clay coloured sediment between the lamina : Sur- 

 face, opake, without lustre. I obtained from 100 parts, 

 silex 4, alumina 6, carbonat of magnesia 14. The rest 

 was pure limestone. 



No. 5. Hughes's. Colour, white inclining to grey : 

 Fracture uneven : Surface, splintery, opake, void of 

 lustre. I obtained from 100 parts, silex 5, alumina 2, 

 carbonat of magnesia 12. The rest, pure limestone. 



No. 6. Dr. Gardener's. Colour, greyish inclining to 

 blueish white. Fracture uneven : Texture, a very line, 

 easily-poundf d, sandy grit, consisting of minute lustry 

 chrystals. I obtained from 100 parts, silex 2, alumina 

 0, carbonat of magnesia 16. The rest, pure limestone. 



No. 7. Barnefs. Colour, white with a very slight 

 clay colom*ed tinge ; Fracture uneven : Surface, chrys- 

 tallized lustry facets : Texture, saccharoid, the same 

 as the saccharoid limestone on the York turnpike road 

 about 10 miles from Baltimore. I obtained, silex 1, 

 alumina 0, carbonat of magnesia 14. The rest, pure 

 limestone. 



No. 8. Bull's. Appearance like No. 7, only the fa- 

 cets of the chrystals much smaller. Silex 1, alumina 

 0, carbonat of magnesia 14, the rest limestone. 



No. 9. Baker's. Colour, ash-grey intermixed with 

 brown mica, so as to bear the appearance of a mixture 



