ITS MODIFICATIONS. 207 



Class g. Lateral solid angles replaced by single 

 planes inclining* on the superior edges. 



Class h. Lateral solid angles replaced by two 

 planes, which intersect each other at an edge that 

 inclines on the superior edges; and which also in- 

 tersect the adjacent primary planes parallel to their 

 oblique diagonals. 



Class i. Lateral solid angles replaced by two 

 ,planes, which like those of class h, intersect each 

 other at an edge that inclines on the superior edges, 

 but do not intersect the adjacent primary planes 

 parallel to their oblique diagonals. 



