WINDOW-PANE CRYSTALS 



197 



showing the same law referred to in the remarks on 

 snow crystals. The whole area of one-tenth of an 



Fig- 53- Crystals formed by breathing on a window during frost. 



The photograph, taken through the microscope by Dr. Maddox, embraced 

 only yjfth of an inch. 



inch, not a very extensive field of view, yet it contains 

 a vast number of lines, for it took me over two hours 



