54 



tached, as if it were done on purpose, nearly as figured in, 

 the outline, which gives it the appearance of lying fitted 

 on the column ; indeed the two acute ends are partly trun- 

 cated by the narrower faces of the octagonal column. 



The right hand outline shows the faces of the pyramid 

 and column, which are very distinct. 



The left hand figure represents the modifications of 

 some of the other small Crystals, with three oblique faces 

 not before observed by any author, — the thin outline and 

 shining part shows one of them : it was done thus^ in order; 

 that it might be known most distinctly. 



