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When The Dog Is Repeatedly Teased With The Sight Of Objects Inducing Salivary Secretion From A Distance, The Reaction Of The Salivary Glands Grows Weaker And Weaker And Finally Drops To Zero.

In The Dog Two Conditions Were Found To Produce Pathological Disturbances By Functional Interference, Namely, An Unusually Acute Clashing Of The Excitatory And Inhibitory Processes, And The Influence Of Strong And Extraordinary Stimuli. In Man Precisely Similar Conditions Constitute The Usual Causes Of Nervous And Psychic Disturbances. Different Conditions Productive Of Extreme Excitation, Such As Intense Grief Or Bitter Insults, Often Lead, When The Natural Reactions Are Inhibited By The Necessary Restraint, To Profound And Prolonged Loss Of Balance In Nervous And Psychic Activity.

As We Have Seen, Bread, And Especially Dry Bread, Evokes Secretion Of Considerably Larger Quantities Of Saliva Than Meat.

School Yourself To Demureness And Patience. Learn To Inure Yourself To Drudgery In Science. Learn, Compare, Collect The Facts.

It Is Still Open To Question Whether Psychology Is A Natural Science, Or Whether It Can Be Regarded As A Science At All.