4.6 



MOLECULES. 



cules of a form which is common to all; and let us 

 suppose this common molecule to be a cube. 



Fig. 75, 76, 77, and 78, shew the arrangement of 

 the cubic molecules in each of these forms. 



Fig. 75. 



Fig. 75 in the cube. 

 Fig. 76. 



Fig. 76 in the tetrahedron. 

 Fig. 77. 



Fig. 77 in the octahedron, 



