3* 



earthy. There are dispersed through the whole several sphe- 

 rules of a laminated texture, which were first observed by- 

 Mr. Howard. 



The upper figure is a fragment showing the coat and the 

 indentations common to most of these stones, also the little 

 reticulated cracks sometimes filled up with the whiter parts 

 of the stone. 



The right hand middle figure shows the other side of the 

 same fragment, with a vein of iron, somewhat oxidated, 

 since being broken ; also little knots of iron, of a metallic 

 lustre, which are irregularly scattered among the more mi- 

 nute particles of the same, with pyrites in the mass of the 

 whitish earthy substance, composed of silex and magnesia. 



The left hand figure shows the vitreous substance found 

 in some parts of the stone, highly magnified. Count Bournon 

 has found the same in the Sienna one. It is to be scratched 

 with the nail, else we should have compared it with 

 the peridot of Bournon, or chrysolite of Werner, which is 

 found in the Siberian iron. It is remarkable, that besides 

 this substance I have some crystallized pyrites adhering to a 

 piece of Siberian iron in my possession. 



The lower right hand fragment is magnified. It shows the 

 granular formation of the stone, with somewhat tarnished 

 pyrites, and the particles of iron in circular rows. 



The two bottom left hand figures represent the earthy shpe- 

 rules*. 



The following account of the Yorkshire stone was com- 

 municated by Major Topham : 



The man who, by some fortuitous circumstance, happens 

 to possess any extraordinary curiosity, has a very trouble- 

 some companion. He is liable to have his time occupied in 



* These agree partly with those found by the Count de Bournon in the 

 Bohemian stone. 



