218 J. L. Smith on the Colorado Meteorite. 
to presume that carbonic acid, under pressure and at common 
temperature, would alter the degree of action above illustrated. 
Il. How does carbonate of magnesia act upon sulphate of lime in 
the presence of free carbonic acid and chlorid of sodium ?—lIn this 
investigation I proceeded thus: I weighed into a glass bottle 31 
parts of commercial carbonate of magnesia, 86 parts of gypsum, 
58 parts of chlorid of sodium, and 3000 parts of distilled wa- 
ter, and-treated the whole mass with carbonic acid gas for sev- 
eral weeks, as described in a former experiment. The filtrate, 
1. That gypsum, carbonate of magnesia, and carbonic acid in 
the presence of chlorid of sodium, form chlorid of magnesium, 
sulphate of soda, and carbonate of lime. 
2. That at a certain higher temperature, the sulphate of soda 
and chlorid of magnesiuin partly re-transform into sulphate of 
magnesia and chlorid of sodium. 
3. That the solubility of the gypsum governs the degree of 
decomposition. 
: (To be continued.) 
Art. XXXIIL—A new Meteoric Iron, “ the Colorado meteorite,” 
Jrom Russel Gulch, Gilpin Co., near Central City, Colorado Ter- 
ritory ; by J. LAWRENCE Situ, Prof. Chem. in University of 
Louisville. 
I HAVE known of the existence of a new meteoric iron from 
