52 PREVIOUS INVESTIGATIONS UPON ANIMALS 



that both serous and egg albumin are coagulated under the action of 

 an intense light; the serum of the horse only slightly. A solution 

 of peptone remains clear, though becoming yellow, and the same 

 effect was noted with casein. These results are all attributed to the 

 ultra-violet portion of the light. Radium rays were found to coagu- 

 late vitellin, but not other albumins. 



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