Mineralogy and Geology. 269 
ous rocks. Consequently, they remark, “that most, if not all, of the 
west; a 
schistose beds, which represent the Genesee slate; whilst our black 
slate and the underlying shell-beds of the Falls of the Ohio, with the 
Goniatite limestone of Rockford, Jackson Co., Indiana, as well as the 
upper glades of Perry Co., Tenn., containing the Calceola sandalina, 
trypa Wilsoni, Phacops macrophthalma, Pleurorhynchus, Pentremites 
Rheinwardi, Atrypa prisca, Spirifer (like Ostiolata of Schlotheim), 
ci rose prisca, &c., are the representatives of the Devonian system 
of Europe. 
at the entucky |i ommences the lower division of the carboniferous 
ks—* the formation of the knobs ;” it has an anticlinal axis at Bar- 
ren river, and beyond Gla Ky., is covered by another carbonifer- 
rens ;” it is inferior in relative position to the coal beds. This forma- 
tion of the Barrens extends on forty-five miles, to the summit of Mul- 
drow’s Hill, Ky., where the lower division of the carboniferous rocks 
(Phil. Mag., xxx, p. 397, from Ann. de Chem. et de Phys., for April, 
1847.)—In each of the five experiments: which we made at the Great 
level rises. The mean inclination of the sides of this cup is 13°. 
In the centre of the basin is a circular well, which appears perfectly 
"50, according as the projected column had attained a greater or less 
height ; the former level is not restored until after six or seven hours. 
Sir W. J. Hooker thus describes it:—‘* To compare great things with small, 
the shape of this basin resembles that of a saucer with a circular hole in its mid- 
dle.” ‘Tour in Iceland, p. 117.—TR. 
