324 IVIESSES. E. FKANKLAND AND B. F. DUPPA'S 



I. '1964 grm. gave -2538 grm. carbonic anhydride and -1005 grm. water. 

 II. -5202 grm. gave -3073 grm. baric sulphate. 



When this barium-salt in aqueous solution is decomposed with the exact amount of 

 sulphuric acid necessary, the liquid filtered ofi" from the baric sulphate, and evaporated in 

 vacuo, the acid crystallizes magnificently. Professor W. Hallows Millee of Cambridge 

 has kindly examined and measured these crystals for us with the following results : — 



Anorthic : — 



10 0, 110=66° 2'; 



110, 010=34^15'; 1 0, 01=76° 40'; 



001,101=29° 4'; 01 0, 1=75° 13'. 



