Ivan Pavlov

The physiologist who succeeds in penetrating deeper and deeper into the digestive canal becomes convinced that it consists of a number of chemical laboratories equipped with various mechanical devices.
The physiologist who succeeds in penetrating deeper and deeper into the digestive canal becomes convinced that it consists of a number of chemical laboratories equipped with various mechanical devices.
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These are some quotes by Russian author Ivan Pavlov Psychologist, who lived between September 14, 1849 and February 27, 1936.