Never Think That You Already

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.

Edible Substances Evoke The Secretion Of Thick, Concentrated Saliva. Why? The Answer, Obviously, Is That This Enables The Mass Of Food To Pass Smoothly Through The Tube Leading From The Mouth Into The Stomach.

Thanks To Our Present Surgical Methods In Physiology We Can Demonstrate At Any Time Almost All Phenomena Of Digestion Without The Loss Of Even A Single Drop Of Blood, Without A Single Scream From The Animal Undergoing The Experiment.

As Was To Be Expected, The Discovery Of The Nervous Apparatus Of The Salivary Glands Immediately Impelled Physiologists To Seek A Similar Apparatus In Other Glands Lying Deeper In The Digestive Canal.

The Gastric Laboratory Uses Its Protein Ferment Under An Acid Reaction.