176 



Having, as I believe, sufficiently shown that — as would be expected 

 from its resemblance to the corundum gems of nature — the artificial gem 

 corundum forms single hexagonal crystals, I will now briefly indicate 

 how practical advantage may be taken of this fact in the cutting of fine 

 gems. Tlie lapidary may now liy mere inspection of the bonle determine 



fToure I 



T eLLo uu» (5cipp n i re 

 Vieuued oo f LatTeoecloicle. 



I hy liiidiiiL,' Ihc llatleni'd side) the loration of tlie Itasal jilaues of the 

 ci-ystnl. He should then cut the stone so that th<' finished product will 

 jiave the table (large top facet) p-arallei to llie flattened place on the 

 boule (i. e., parallel to the basal jilanes of the crystal). \o\v a study 



