156 JouKNAL OF THE MiTCHELL SociETY \_Fehruary 



This determination, which was made in the laboratory of the 

 Welsbach Light Company, showed this monazite to contain 5.06 

 per cent, thoria, which is equal to the percentage of thoria in 

 the best commercial monazite found in the South Mountain 

 region. 



The size of the crystals of monazite found in this deposit, 

 which are perhaps the largest on record, make this discovery a 

 most interesting one. 

 Chapel Hill, N. C. 



