[ 135 ) 



the bard silex stone, often of i| or 2 feet diame- 

 ter, should so break, can hardly be conceived. 

 Tbat pressure bas been experienced, when in a 

 soft state, is shown by the flattened appearance 

 of some specimens. The black color has drained 

 offwith the water percolating through them: many 

 lumps, which have become externally white or 

 of a reddish hue, are still black at the centre. 



Jasinga, 27th November 1837. 

 JONATHAN RIGG. 



