WHITLOCK. — CRYSTAL FORMS OF CALCITE. 



295 



Hypothetical Pyramids. The only two members missing from 

 normal series N 3 in the above development are ^ and f corresponding 

 respectively to (4489) and (8 -8 -IB -9). 



(4489) = (73i). Parallel zones through the poles of this form do 

 not pass through the poles of common forms or of those whose indices 



