0. D. von Enyeln — Studies on Ice Structure. 455 

 Fig. 3. 



Wllffifl 





Fia. 3. Same ice cylinder as shown in fig. 2 after reduction in size by 

 slow melting and evaporation (mostly latter) in outdoor laboratory. Note 

 outlines of crystals as shown by etching out of crystal boundaries into dis- 

 tinct grooves. Natural size approximately 8 in. high by 4 in. wide, original 

 cylinder 12 in. by 5 in. 



Fig. 4. 



Fig. 4. End view of ice cylinder shown in fig. 3 and photographed at the 

 same time. Shows roughly parallel orientation of crystals, their relative 

 lengths and wedge-shaped terminations. 



