ITS MODIFICATIONS. 



Class d. Terminal solid angles replaced by six 

 planes, producing, ultimately, a series of dodeca- 

 hedrons whose planes are generally scalene triangles* 



Class e. Lateral solid angles replaced by single 

 planes parallel to the perpendicular axis of the 

 rhomboid. 



Planes e, are the lateral planes of a regular hex- 

 agonal prism. 



Class f. Lateral solid angles replaced by two 

 planes, meeting at an edge which is parallel to the 

 perpendicular axis of the rhomboid. 



Planes f represent the lateral planes of a series of 

 dodecahedral prisms. 



