274 Jfoses — 2'ests nj)i)ti the Synthetic Scqyphives of Verneuil. 



definitely biaxial in otlieis with the orientation of the axial 

 plane vanino-. Siniihir oj>tieal behavior is recorded for some 

 crystals of true sapphire. Tlie optic axis was not coincident 

 with the cone axis but was at about 40° to it. 



While, strictly speaking, the crystalline system is not deter- 

 mined, the recorded tests sliow that tlie cone-shaped mass is an 

 anhedral crystal with all determinable characters closely 

 resembling those of natural sapphire. 



