William Harvey


English Physician, first to describe and detail blood circulatory system

Author Quotes

In man, then, let us take the amount that is extruded by the individual beats, and that cannot return into the heart because of the barrier set in its way by the valves, as half an ounce, or three drachms, or at least one drachm. In half an hour the heart makes over a thousand beats; indeed, in some individuals, and on occasion, two, three, or four thousand. If you multiply the drachms per beat by the number of beats you will see that in half an hour either a thousand times three drachms or times two drachms, or five hundred ounces, or other such proportionate quantity of blood has been passed through the heart into the arteries, that is, in all cases blood in greater amount than can be found in the whole of the body. Similarly in the sheep or the dog. Let us take it that one scruple passes in a single contraction of the heart; then in half an hour a thousand scruples, or three and a half pounds of blood, do so. In a body of this size, as I have found in the sheep, there is often not more than four pounds of blood.

This organ deserves to be styled the starting point of life and the sun of our microcosm just as much as the sun deserves to be styled the heart of the world. For it is by the heart's vigorous beat that the blood is moved, perfected, activated, and protected from injury and coagulation. The heart is the tutelary deity of the body, the basis of life, the source of all things, carrying out its function of nourishing, warming, and activating body as a whole. But we shall more fittingly speak of these matters when we consider the final cause of this kind of movement.

In the above sort of way, by calculating the amount of blood transmitted [at each heart beat] and by making a count of the beats, let us convince ourselves that the whole amount of the blood mass goes through the heart from the veins to the arteries and similarly makes the pulmonary transit.

Toil of the mind destroys health by attracting the spirits from their task of concoction to the brain; whither they carry along with them clouds of vapours and excrementitious humours.

It helps us to maintain one of the things we are proud of -- reserves... Regardless of how many hurricanes hit us, and we were hit with several last year, we have managed to maintain our reserves. I think one of the things a city has to do is to maintain itself, not only operate in the black daily, but (remain) in the black when you hit your reserves.

Very many maintain that all we know is still infinitely less than all that still remains unknown.

It is, however, an argument of no weight to say that natural bodies are first generated or compounded out of those things into which they are at the last broken down or dissolved.

We try to run a clean program, so we consider any violation \'serious' if it's proven to be true, ... But right now, these are just allegations. The committee will meet with the NCAA to determine the number of possible violations and their nature.

Memory cannot exist without endurance of the things perceived, and the thing perceived cannot remain where it has never been.

What amaritude or acrimony is deprehended in choler, it acquires from a commixture of melancholy, or external malign bodies.

Moderate labor of the body conduces to the preservation of health, and cures many initial diseases.

When in many dissections, carried out as opportunity offered upon living animals, I first addressed my mind to seeing how I could discover the function and offices of the heart's movement in animals through the use of my own eyes instead of through the books and writings of others, I kept finding the matter so truly hard and beset with difficulties that I all but thought, with Fracastoro, that the heart's movement had been understood by God alone.

All we know is still infinitely less than all that remains unknown.

Nature is nowhere accustomed more openly to display her secret mysteries than in cases where she shows tracings of her workings apart from the beaten paths; nor is there any better way to advance the proper practice of medicine than to give our minds to the discovery of the usual law of nature, by careful investigation of cases of rarer forms of disease.

And so I conclude that blood lives and is nourished of itself and in no way depends on any other part of the body as being prior to it or more excellent... So that from this we may perceive the causes not only of life in general... but also of longer or shorter life, of sleeping and waking, of skill, of strength and so forth.

Our total consolidated earnings were obviously battered by the charges related to our Brazil investments. However, we continue making good progress in streamlining our business portfolio.

Doctrine once sown strikes deep its root, and respect for antiquity influences all men.

Restlessness and intermission from sleep grieved persons are molested with, whereby the blood is dried.

Even if this may take more than half an hour or an hour or a day for its accomplishment, it does nevertheless show that the beat of the heart is continuously driving through that organ more blood than the ingested food can supply, or all the veins together at any time contain.

Take a walk to refresh yourself with the open air, which inspired fresh doth exceedingly recreate the lungs, heart, and vital spirits.

Everyone admits that the male is the primary efficient cause in generation, as being that in whom the species or form resides, and they further assert that his genitures emitted in coitus causes the egg both to exist and to be fertile. But how the semen of the cock produces the chick from the egg, neither the philosophers nor the physicians of yesterday or today have satisfactorily explained, or solved the problem formulated by Aristotle.

The animal's heart is the basis of its life, its chief member, the sun of its microcosm; on the heart all its activity depends, from the heart all its liveliness and strength arise. Equally is the king the basis of his kingdoms, the sun of his microcosm, the heart of the state; from him all power arises and all grace stems.

I avow myself the partisan of truth alone.

The challenge prior to the court decision was deciding exactly what methods and approaches they could use ... Educating All of One Nation.

I just start singing, and it all comes back.

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English Physician, first to describe and detail blood circulatory system