Perfect as the wing of a bird may be, it will never enable the bird to fly if unsupported by the air. Facts are the air of science. Without them a man of science can never rise.

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

As we have seen, bread, and especially dry bread, evokes secretion of considerably larger quantities of saliva than meat.

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.

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.

Appetite, craving for food, is a constant and powerful stimulator of the gastric glands.

Science demands from a man all his life. If you had two lives that would not be enough for you. Be passionate in your work and in your searching.