95 



The following forms have been found : 



a{lOO}, 6{010}, с {001} 



w{no}, w{l20}, o{l30}, p[210} 



d{0l2}, elOil], /"{ОЗ2}, f/{02l}, Л {052}, г{031} 



r{lOl}, s {201} 



^{111}, w{lU}. 



The faces are determined by the following angles: 



Among the angles in the above table the one for o{l30} 

 is especially conspicuous on account of the great deviation 

 between the value found and the value calculated, this deviation 

 amounting to about 1V2°; this is owing to the fact that the 

 prismatic face in question is almost always accompanied by one 

 or more vicinal faces, which are all turned to the front but 

 cannot be more exactly determined on account of the nature of 

 the faces; the case is somewhat similar with regard to p{270}, 

 but as this face is determined by rather few measurements, 

 the feature may perhaps be casual. All the other measured 

 values correspond tolerably well with the calculated ones. 



