Studies on crystal semi-permeable membrane. II. On the formation of barium sulfate semi-permeable membrane.

The 1st report1) in a series of these studies, which was deduced from the report by Miyamoto and Takikawa2) that a precipitate of calcium silicate and magnesium silicate formed a semi-permeable membrane at the Pringsheim'a equilibrium point, recognized a formation of the so-called •hCrystal semi-permeable membrane•h also in a common water-insoluble salt (In this case, sodium carbonate and calcium chloride system was used). Therefore, further study cleared up that the other 2-2 salts, that is, Ba++-SO4-system, applied to this rule. The authors here report this fact.