An Introduction to the Study of Experimental Medicine; One: Experimental Reasoning; 1: Observation and Experiment; 2: The a Priori Idea and Doubt in Experimental Reasoning; Two: Experimentation with Living Beings; 3: Experimental Considerations Common to Living Things and Inorganic Bodies; 4: Experimental Considerations Peculiar to Living Beings; Three: Applications of the Experimental Method to the Study of Vital Phenomena; 5: Examples of Experimental Physiological Investigation; 6: Examples of Experimental Physiological Criticism; 7: Investigation and Criticism as Applied to Experimental Medicine; 8: Philosophic Obstacles Encountered by Experimental Medicine