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To quote briefly without essential change from my previous paper: I n a gelatine solution containing bichromate, when silver nitrate is added, concentric rings are formed because the ion in the gelatine is relatively fixed. The silver ion wanders out and forms a ring by precipitation. A region on the. chromate side of the ring is freed from the chromate ion, and a corresponding region on the silver side is freed from the silver'ion. Growth stops until the silver again wanders out through thedoi:10.1126/science.55.1413.101 pmid:17756886 fatcat:gizbxhhg3rbg7b53phtjqygj3m