200 



sometimes attached by a greater or smaller base, so as to 

 be nearly detached spheres ; at other times only half a 

 sphere or less. 



At Buxton, Derbyshire, however, detached balls are found, 

 not far under the surface of the common earth: seethe three 

 figures in the middle. They seem to be formed among 

 loam, and partake of an ochraceous hue ; the edges are fre- 

 quently more separated, and less regularly rounded. They 

 have occasionally attached to them single cubic crystals 

 of fluor in a decomposing state ; of which more hereafter. 



These are somewhat related to the celebrated Bolognian 

 stone, which shines like phosphorus in the dark; and if 

 heated red hot in a common fire, it is said to assume the 

 same property. They are allied also to the liver-stone *, 

 which has its name from its hepatic scent, derived from 

 sulphuret of ammonia or liver of sulphur. Varieties are 

 found in Great Britain, which, when rubbed, give nearly 

 the odour of stink-stone : see tab. 38. 



* Found in Adrarium, in Scania. 



