Abstract 1. The amorphous precipitate of barium sulfate changed to a crystalline state by aging. 2. The precipitated particles produced in uniform size remained almost unchanged for a few months, but they became perfect for a long period (i. e. a few years). 3. When the particles of two different sizes formed directly after mixing the reagents, the smaller particles went into solution and the larger particles grew at the expense of the small ones. 4. In the case of dilute reagents the rapid change of conductivity was observed in an early stage of the reaction. The nucleus probably formed during this stage. 5. The precipitation was promoted by the nucleus added before the reaction, but the presence of the nucleus did not affect the shape of the precipitated particles.
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Suito et al. (1954) studied this question.
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