184 



BRIDGMAN. 



All the preceding considerations apply to transitions of the ice type. 

 The ordinary type of transition, in which the form stable at the higher 

 temperature has the larger volume, may be thought of as one in which 

 projections on one molecule fit into depressions on others, the centers 



Figure 36. Hypothetical substance. This arrangement does not allow 

 temperature agitation of much violence. 



Figure 37. The atoms of Figure 36 in another arrangement occupying 

 more volume and allowing greater violence of agitation. 



of force being on the projections or in the depressions. The projec- 

 tions or depressions are such that the molecules must be fitted together 

 rather precisely to secure proper alignment. Temperature throws 



