THE IDENTITY OF CERTAIN YELLOW PIGMENTS IN PLANTS AND ANIMALS

Geo. B. Rigg
1922 Science  
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 the
more » ... out through the precipitate, and comes within range of the chromate ion when the process is repeated. The essentials of this interrupted growth theory are given in the previous article. '~olmes' 5 theory closely resembles mink. Bradford's assumes unnecessary facts to explain the phenomenon. Later, I expect to give a more detailed account of this common phenomenon.
doi:10.1126/science.55.1413.101 pmid:17756886 fatcat:gizbxhhg3rbg7b53phtjqygj3m