46 



TERMINOLOGY. 



Fig. 107, the same, with the lateral solid angles E replaced by 

 single planes. 



According to the geometrical properties of the Rhomboid, as they 

 have been explained, (. 46.) we must look for similar modifications 

 either upon the two terminal solid angles, upon the six lateral an- 

 gles, upon the six upper edges, or upon the six lateral edges. The 

 following examples, principally from a single species, Carbonate of 

 Lime, will render this sufficiently obvious. 



Fig. 108 represents the Rhomboid, with its lateral edges replaced 

 by tangent planes. 



Fig- 108. Fig . 109 . 



Fig. 107. 



Fig. 109, the same, with its superior edges replaced by tangent 

 planes. 



Fig 110-, the same, with its superior edges replaced by two planes. 



Fig. Ill, the same, with its terminal solid angles replaced by 

 tangent planes. 



iff. no. 



Fig;. 111. 



