NOME VIII. KOLLANITE. 



who, however, commonly call it simply pudding- 

 stone, or English pudding-stone (ponding, of 

 Brochant; poudding Anglais, of Haiiy). Fo- 

 reigners also seem to apply the name to varieties 

 of pebble-stone in general. In the pebble-stone 

 of Berkshire, the cementing substance is often 

 so highly indurated, and so firmly adheres to the 

 pebbles, that upon the application of a sufficient 

 degree of force, the fracture of the stone is car- 

 ried on indifferently through the pebbles as well 

 as the cement j in some instances the fracture 

 takes place in such a manner as to leave some 

 of the pebbles half imbedded in the stone, and 

 half projecting from the broken surface ; which 

 probably depends either upon a considerable 

 difference in the hardness of the pebbles, and 

 the cement at those parts ; or upon a slighter 

 adhesion than usual between the two. 



" In some instances the cemented particles 

 are angular fragments of pebbles. Both varieties, 

 when the cement is sufficiently hard and com- 

 pact, are capable of a very beautiful polish. 



" With respect to pebble-stones in general, 

 their appearance is as various as can possibly 

 result from a variety in the colour, form, size, 

 and degree, and mode of union, of their com- 

 ponent parts. The hardest I ever met with, 



