of Crystalline Combinations. 421 
OBLONG-PYRAMIDAL SYSTEM. 
Relations of Edges, &c. 
The principal terminal edges of the pyramid pPm are replaced by the faces in pairs 
of pP. 
E. C. parallel to each other and to the above principal edges. 
The transverse terminal edges of the pyramid pP’m are replaced by the faces in pairs 
of pP. 
E. C. parallel to each other and to the above terminal edges. 
The principal terminal edges of the pyramid gnP are replaced by the faces in pairs 
of gPn. 
E. C., parallel to each other and to the above transverse terminal edges. 
The transverse terminal edges of the pyramid guP are replaced by the faces in pairs 
of gP’n. 
E. C. parallel to those edges. 
The transverse terminal edges of the pyramid pP are replaced by the faces of the 
horizontal prism. 
E. C. parallel to each other and to these terminal edges. 
The principal terminal edges of the pyramid pP are replaced by the faces of the 
horizontal prism. 
E. C. parallel to each other and to these terminal edges. 
The faces of $pP’r will appear as rhombs replacing the corners at the upper edge 
of the compound figure pP, pPr. 
The form appears as a vertical rhombic prism terminated by a pyramid in a diagonal 
position. 
All the faces of the figure are rhombs. 
