In Teaching Man, Experimental Science Results In

In The Philosophic Sense, Observation Shows And Experiment Teaches.

We Must Alter Theory To Adapt It To Nature, But Not Nature To Adapt It To Theory.‎

Proof That A Given Condition Always Precedes Or Accompanies A Phenomenon Does Not Warrant Concluding With Certainty That A Given Condition Is The Immediate Cause Of That Phenomenon. It Must Still Be Established That When This Condition Is Removed, The Phenomen Will No Longer Appear.

Men Who Have Excessive Faith In Their Theories Or Ideas Are Not Only Ill Prepared For Making Discoveries; They Also Make Very Poor Observations. Of Necessity, They Observe With A Preconceived Idea, And When They Devise An Experiment, They Can See, In Its Results,only A Confirmation Of Their Theory. In This Way They Distort Observation And Often Neglect Very Important Facts Because They Do Not Further Their Aim.

All The Vital Mechanisms, Varied As They Are, Have Only One Object, That Of Preserving Constant The Conditions Of Life In The Internal Environment.