26 



the three solid angles of the pyramid ; the terminal faces are 

 those of the equiaxe and primitive. 



The lower is a group of nearly the same nature with the 

 seams, if I may so call them, more closed, except in 

 some places where there are small crystals formed, so as to 

 appear as if bursting out of the cover, on which the py- 

 ramids rest, or from which they are a continuation. 



The lower part of the upper figure has the nucleus very 

 distinctly in its place, and the diagonal fracture is very 

 distinct, and serves to show the base of the pyramid. The 

 Earl of Dartmouth brought me some opaque Limestone 

 from Lord Dudley's mine with these fractures very distinct, 



