33 hour and finally a precipitate was formed in it. Lenses were immersed in water for one day and the fluid was afterwards exposed to these radiations. It became opalescent after twenty minutes and a light precipitate was formed later. In both cases, the appearance was due to precipitation of dissolved lens proteins by the radiations. Lenses without capsules were immersed for 20 hours in fluids of different H-ion concentrations and the fluids were afterwards exposed to the radiations from the mercury-vapour lamp for an hour. Acid potassium phosphate solution of pH 4.2 became opalescent in half an hour, and the opalescence increased to the end of the hour's exposure; a mixture of acid potassium phosphate and sodium hydroxide solutions of pH 6.6 became very slightly opalescent, and a mixture of the same solutions of pH 8.4 showed no change.
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- Clare Harris
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Some observations on the crystalline lens , From The Royal Society, MS/165
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