176 



n.iviii.ic, as I believe, snflicieiitly shown that — as woiikl bo expected 

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

 (■(irniulnm forms single hexagonal crystals. T will now brietiy indicate 

 lidW ]iractl<;il advantag'.' may be lakcn of this lact in the cutting of fine 

 gems, 'riic hipidary may ndw by nu-i'c iiisiicction of th<' bonle determine 



fToure I 



T eLLouj(5appnir6 

 Vietued oo pLatteoecloicle, 



(by finding the flattened side) the hical imi nl llic basal iilancs of the 

 crystal. He should then cnl the slmii' so Ihai ilic finished iirndntt will 

 have llie t.ablo (lai-ge top facet I i'.-iraliei to the llattened place on the 

 bonle ( i. e.. jiai-allel |i; the basal iilaucs of the cryst.ih. Now .a sindy 



