BASE, AND ITS MODIFICATIONS. 145 



Class /. Edges of the pyramids replaced by single 

 planes. 



A series of octahedrons with rhombic bases would 

 result from Classes h, i, k, and /. 



Class m. Greater edges of the base replaced by 

 single planes. 



Class n. Greater edges of the base replaced by 

 two planes. 



Class <?. Lesser edges of the base replaced by 

 single planes. 



