and Partial Solution of Minerals, Bocks, ^c. 165 



rated by filtration is evaporated to dryness in a platinum cap- 

 sule. The residuum is then critically examined, and, if in 

 sufficient amount, is submitted to quantitative analysis. 



In both processes, tfvo parallel experiments are made, the 

 one with pure de-aerated water, the other with water charged 

 to saturation, at 60°, with COo. In the second process, the 

 alkali, lime, &c., which may be dissolved by action on the 

 containing glass, are determined by parallel experiments, 

 with bottles of the same kind, charged, the one with simple 

 water, the other with carbonated water, and exposed to the 

 solvent action for the same time, and with the same agita- 

 tion as those containing the powdered minerals. 



The following is a list of the minerals and other substances 

 which we have subjected to the analytic action of pure water 

 and of carbonic acid water. 



Potash felspar (3var.), Soda felspar, Lithia felspar. Glassy 

 felspar, Labradorite, Mica (2 var.), Leucite, Analcime, Me- 

 sotype, Scolecite, Schorl (2 var.), Greenstone (2 var.). Chal- 

 cedony, Obsidian, Lava, Gneiss, Hornblende slate, «tc., Soils, 

 Chlorite (2 var.). Talc (2 var.), Serpentine, Steatite, Olivine, 

 Hypersthene, Hornblende (2 var.), Actynolite, Tremolite, 

 Augite, Asbestus (2 var.), Coccolite, Epidote massive, Epi- 

 dote crystals (2 var.), Axinite, Prehnite, Brown Garnet, Do- 

 lomite, Flint-glass, Green bottle-glass, Green German glass, 

 Hard white Bohemia glass, Wedgewood mortar, Chinese 

 porcelain, Anthracite, Bituminous coal. Lignite, Charcoal, 

 Ashes of coal and wood. Woods. 



(1.) By the tache process, we find that all the minerals 

 and glasses in this list are partially decomposed and dis- 

 solved by carbonated water, and most of them also by pure 

 water. 



When the substance is very minutely powdered before 

 mingling with the liquid, even the first drops that pass the 

 filter will commonly give a tache containing some of the alkali 

 or alkaline earth that has been dissolved. In this way, proof 

 of the solvent power of the carbonated water may generally 

 be obtained in less than ten minutes after adding it to the 

 powder. As the action is continued, by returning the liquid 

 to the filter, the efi^'ect is increased. In the case of simple 



