1S14.] On the Composition of Arragonite. 249 



The following table exhibits the constituents of 100 parts of 

 arragonite, according to the medium of a number of experiments, 

 varying but little from each other : — 



The following table exhibits the result of the analysis of the two 

 specimens of pure rhomboidal spar : — 



These proportions of native carbonate of lime agree with the 

 latesl determinations of Berzelius and the author respecting artificial 

 carbonate: ' and afiurd a new proof that natural comhinations con- 

 sist of the same invariable proportions as the artificial. 



• f •.ulinnate of lime, according to Berzelius, is composed of 5C4 of lime and 

 43*6 carbonic acpl. 



