One can truly say that the irresistible progress of natural science since the time of Galileo has made its first halt before the study of the higher ….

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

It goes without saying that the desire to accomplish the task with more confidence, to avoid wasting time and labour, and to spare our experimental a….

Gradualness, gradualness, and gradualness. From the very beginning of your work, school yourself to severe gradualness in the accumulation of knowled….

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

The Sun-Paul must consider only one thing: what is the relation of this or that external reaction of the animal to the phenomena of the external worl….

Possibilities are like the wings of birds; they allow man to soar and to climb to the heavens. And facts are like the atmosphere against which those ….

It has long been known for sure that the sight of tasty food makes a hungry man's mouth water; also lack of appetite has always been regarded as an u….

Edible substances evoke the secretion of thick, concentrated saliva. Why? The answer, obviously, is that this enables the mass of food to pass smooth….

When the dog is repeatedly teased with the sight of objects inducing salivary secretion from a distance, the reaction of the salivary glands grows we….

In the case of the stomach, however, the nerves of the glandular cells were always severed when constructing an artificially isolated pouch and this,….

But man has still another powerful resource: natural science with its strictly objective methods..

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 gast….

Perfect as the wing of a bird may be, it will never enable the bird to fly..

Our success was mainly due to the fact that we stimulated the nerves of animals that easily stood on their own feet and were not subjected to any pai….

School yourself to demureness and patience. Learn to inure yourself to drudgery in science. Learn, compare, collect the facts..

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….

Finally, as the digestive canal is a complex system, a series of separate chemical laboratories, I cut the connections between them in order to inves….

Never think that you already know all. However highly you are appraised, always have the courage to say to yourself-I am ignorant..

It is still open to question whether psychology is a natural science, or whether it can be regarded as a science at all..

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