While you are experimenting, do not remain content with the surface of things.

The digestive canal represents a tube passing through the entire organism and communicating with the external world, i.e. as it were the external surface of the body, but turned inwards and thus hidden in the organism.

It is not accidental that all phenomena of human life are dominated by the search for daily bread - the oldest link connecting all living things, man included, with the surrounding nature.

From the described experiment it is clear that the mere act of eating, the food even not reaching the stomach, determines the stimulation of the gastric glands.

Physiology has, at last, gained control over the nerves which stimulate the gastric glands and the pancreas.

Don't become a mere recorder of facts, but try to penetrate the mystery of their origin.