Smithsonian Report. I %0— Dillon 



Pl-ATE 3 



A color photograph of domains in an ytiriuni ir(.>ii garncl siiiylc crystal. The analy/.cr was 

 somewhat off the setting which corresponded to extinction without llic cr\stal. This 

 was taken hv W. \'andi\'ert for the Scienlific American under the author's direction. 



