Abstract
Ammonia formation in the frog retina varies with the season even with uniform light. The reaction is reversible. Ammonia production is greater in diffuse light than in the dark. In the fall exposure to light did not lead to ammonia production. Use of ultra-violet light of 365-366 mu did not initiate ammonia production. X-rays increased ammonia production both in isolated and intact eyes. The Bucky rays were more effective than other x-rays. Retina in contact with muscle deaminized the adenosin phosphoric acid. The splitting of ammonia from adenosin phosphoric acid is of interest to students of the intermediary metabolism of adenosin.

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