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| Description: The photo shows Ivan Pavlov (in the white beard), flanked by his students and a canine subject. The drawing depicts an apparatus similar to the one he used; saliva from a dog’s cheek flowed down a tube and was measured by the movement of a needle on a revolving drum. Picture Stats: Views: 265 Filesize: 288.87kB Height: 272 Width: 924 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39240 |