222 



TABLE OF SECONDARY FORMS. 



Secondary forms. 



7. CONTAINED WITHIN FORTY- 

 EIGHT TRIANGULAR PLANES. 



Fig. 299. 



How they may be derived. 



From the cube, Modification 

 d. 



regular octahedron. 



Modification d. 



rhombic dodecahe- 

 dron. Modification </, A, or 

 K* 



