When the AgNO3 and KBr solutions were added simultaneously and gradually into a gelatin solution maintained at pAg 6.8, it was observed that the growth rate of small crystals was somewhat faster than that of large crystals forwarding to monodisperse precipitate. The observed dependency of growth rate on crystal dimension was interpreted by assuming the growth controlled by diffusion process. The thickness of diffusion layer around the crystals was estimated to be of the same order as the

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... dimension. Some features of the growth controlled by diffusion were refered comparing with the growth controlled by surface nucleation. •˜1.