ITS MODIFICATIONS. 211 



Class n. Superior edges replaced by two planes. 



A series of dodecahedrons may result from this 

 modification, whose planes are generally isosceles 

 triangles. 



Class o. Lateral edges replaced by tangent planes. 

 Planes o are the lateral planes of a regular hex- 

 agonal prism. 



Class p. Lateral edges replaced by two planes. 



From this modification there results a series of 

 dodecahedrons, whose planes are generally scalene 

 triangles. 



