On the Photochemistry of the Retina And On Visual Purple
The book On the Photochemistry of the Retina And On Visual Purple was written by author Kühne, W. (Willy), 1837-1900 Here you can read free online of On the Photochemistry of the Retina And On Visual Purple book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is On the Photochemistry of the Retina And On Visual Purple a good or bad book?
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Pyro- gallic acid gave rise to some amount of browning of the alka- line membrane, but there was no destruction of the purple or of its sensitiveness to light. Permanganate of potash coloured the retina brown, the tint being of course less deep when the solution was mixed with 2 p. c. of acetic acid. In the mixture the purple remained constant in a wonderful way for several hours, bleaching as usual on exposure to light, with the intermediate stages of orange and chamois. M}' efforts in the inv...erse direction, namely, to find energetic reducing agents, which would decolourize the visual purple or prevent it bleach- ing on exposure to light, were equally unsuccessful. I made use of the mixture of ferrous sulphate or stannous chloride, with tartaric acid and an excess of ammonia, employed by Stokes for the reduction of haemoglobin, but obtained no change of the visual purple and no return of colour in a retina bleached by light. I was equally unsuccessful with ammonium sulphide or hyJric sulphide.
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