CRYSTALLIZATION. 



18 



The symmetrical electro-magnetic unions of 

 particles of water are familiarly exhibited in the 

 feathery crystals of fall- 

 ing snow (Fig. 61). It 

 will be noticed that the 

 arrangements of its 

 molecules are all hexag- 

 onal. Different kinds 

 of molecules have other 

 different and peculiar 

 arrangements, some of 

 which are delineated in 

 Fig. 62, showing their 

 characteristic forms of 

 crystalline polarization. 

 The shapes of crystals 

 are deemed by chemists Fig - 6l> 



to be indications of the peculiar kinds of molecules 

 distinguishing them. 



Fig. 62. 



The hexagonal lines of crystals of water are 

 familiarly seen in the frost-work on window-panes, 

 produced by the axial rotation that predominates 

 during the withdrawal of solar reaction in wintry 

 nights, as previously described. So mathematically 



